While the single-word term previous indicated as defining "a person that uses big words to make themselves seem smarter than others: sesquipedalian" (cf. sesquipedalian:below; etc.) does correlate to the question at hand in its strictly limited relevance to the "use of big [or multi-syllabic] words," the term sesquipedalian does not in any way connote what presumably rests as that greater crux of the question at hand: that of making oneself feel or seem smarter than others, by use of uncommonly large and unfamiliar lexicon in common parlance.

A few rather "sesquipedalian" (i.e., in and of itself, for instance; etc.) yet quite simple double-word phrases that serve as far more fully correct, accurate and definitively just terminology for use in defining "a person [who] uses big words to make [oneself] seem smarter than [others]" would better-yet be identified as follows:

"pedantic (over)-prolixity;"otherwise,...

"(over)-prolix pedant," or...

"prolixiouspedantry"

The more fully correct, accurate and definitely just connotations of these three double-word phrases, as correlating in correspondence with the meaning of the question at hand, should quite easily be demonstrated or at best more-than vaguely understood and appreciated as such, through a short expository representation of the individual definitions of the separate root words, which combined freely together make up the compound phrases:

pedant1

ped·ant / ˈpɛdnt / [IPA]

noun

1. a person who makes an excessive or inappropriate display of learning.

2. a person who overemphasizes rules or minor details.

3. a person who adheres rigidly to book knowledge without regard to common sense.

4. Obsolete . a schoolmaster.

Origin: 1580-90; < Italian pedanteteacher, pedant; apparently akin to pedagogue; see -ant

Related forms:

ped·ant·esque, adjective

ped·ant·hood, noun

Synonyms:

2. hairsplitter.

Dictionary.com Unabridged (from Random House Dictionary), © Random House, Inc. 2013.

pedantic2

pe·dan·tic / pəˈdæntɪk / [IPA]

adjective

1. ostentatious in one's learning.

2. overly concerned with minute details or formalisms, especially in teaching.

Also, pe·dan·ti·cal.

Origin: 1590-1600; pedant + -ic

Related forms:

pe·dan·ti·cal·ly, adverb

pe·dan·ti·cal·ness, noun

sem·i·pe·dan·tic, adjective

sem·i·pe·dan·ti·cal, adjective

sem·i·pe·dan·ti·cal·ly, adverb

un·pe·dan·tic, adjective

un·pe·dan·ti·cal, adjective

Synonyms:

2. didactic, doctrinaire.

Dictionary.com Unabridged (from Random House Dictionary), © Random House, Inc. 2013.

pedantry3

ped·ant·ry / ˈpɛdntri / [IPA (us)]

noun, pluralped·ant·ries.

1. the character, qualities, practices, etc., of a pedant, especially undue display of learning.

2. slavish attention to rules, details, etc.

3. an instance of being pedantic: the pedantries of modern criticism.

Origin: 1575-85; Italian pedanteria. See pedant, -ry

Dictionary.com Unabridged (from Random House Dictionary), © Random House, Inc. 2013.

pedantry4 / ˈpɛd ə ntrɪ / [IPA (uk)] Collins - World English Dictionary

- n ,pl-ries

the habit or an instance of being a pedant, esp in the display of useless knowledge or minute observance of petty rules or details

Collins English Dictionary - Complete & Unabridged 10th Edition 2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009.

prolix5

pro·lix / proʊˈlɪks, ˈproʊlɪks / [IPA]

adjective

1. extended to great, unnecessary, or tedious length; long and wordy.

2. (of a person) given to speaking or writing at great or tedious length.

Origin: 1375-1425; late Middle English < Latin prōlixus extended, long, equivalent to prō- [pro-1] + -lixus, akin to līquī to flow; see liquor

Related forms:

pro·lix·i·ty / proʊˈlɪksɪti / [IPA] , pro·lix·ness, noun

pro·lix·ly, adverb

[...]

o·ver·pro·lix, adjective6

[...]

o·ver·pro·lix·i·ty, noun7

un·pro·lix, adjective

Synonyms:

1. prolonged, protracted. See wordy. 1, 2. verbose.

Dictionary.com Unabridged (from Random House Dictionary), © Random House, Inc. 2013.

Prolixious8

Pro*lix"ious\, a. Dilatory; tedious; superfluous. [Obs.] "Lay by all nicety, and prolixious blushes." --Shak.

The very first definitions (i.e., noun/adjectival, respectively; etc.) of the first two related words (i.e., pedant/pedantic, respectively; likewise) in this list of auto-indicative double-word phrases, defining "a person [who] uses big words to make [oneself] seem smarter than [others]," easily demonstrate -- with indubitably concrete clarity! -- just exactly how the previously suggested single-word term: sesquipedalian, greatly lacks in meanings for which words such as pedant, pedantic, and by extension, pedantry provide.

Where sesquipedalian fails as an appropriately comprehensive connotation for the question of terminology introduced by the question above, the more fully correct, accurate, and definitively just vocabulary listed with annotated definitions above provide much more clearly adequate and unassailable lexical references that directly correspond to connotations of one's unduly ostentatious, inappropriate, and excessive flaunt of learning, while further alluding to the use of tediously superfluous, prolonged, protracted, and unnecessarily verbose language, as part of otherwise mundane and commonplace, everyday communications.

Thus, it should be well-understood that the single-word term previously identified as the lexical reference or vocabulary appropriate for use to describe "a person [who] uses big words to make [oneself] seem smarter than [others]" (i.e., sesquipedalian: as cited, below; etc.) does not provide adequately accurate, comprehensive or just meaning to suffice as the sole and singular terminology to be used in response to the context of this question.

Instead, the three simple, yet sophisticated corresponding double-word phrases, introduced (e.g., herein; above, etc.) with annotated definitions for involved lexicon, should be considered with much more confident assurance and accuracy to be nearer to the key phraseology most appropriate for use when referring to "a person [who] uses big words to make [oneself] seem smarter than [others]," as the question in reference demands more correctly to know...

sesquipedalian9

ses·qui·pe·da·li·an / ˌsɛskwɪpɪˈdeɪliən, -ˈdeɪlyən / [IPA]

adjective Also, ses·quip·e·dal

1. given to using long words.

2. (of a word) containing many syllables.

noun

3. a sesquipedalian word. [...]

Dictionary.com Unabridged (from Random House Dictionary), © Random House, Inc. 2013.

Respectfully submitted:

MATTHEW BLANCHARD (@QHereKidSF)

SAN FRANCISCO, CA 94109-7835 U.S.A.

User:QHereKidSF

ENDNOTES (SOURCES CITED):

pedant. Dictionary.com. Dictionary.com Unabridged. Random House, Inc. http://dictionary.reference.com/browse/pedant (accessed: December 09, 2013).
pedantic. Dictionary.com. Dictionary.com Unabridged. Random House, Inc. http://dictionary.reference.com/browse/pedantic (accessed: December 09, 2013).
pedantry. Dictionary.com. Dictionary.com Unabridged. Random House, Inc. http://dictionary.reference.com/browse/pedantry (accessed: December 09, 2013).
pedantry. Dictionary.com. Collins English Dictionary - Complete & Unabridged 10th Edition.HarperCollins Publishers. http://dictionary.reference.com/browse/pedantry (accessed: December 09, 2013).
prolix. Dictionary.com. Dictionary.com Unabridged. Random House, Inc. http://dictionary.reference.com/browse/prolix (accessed: December 09, 2013).
Ibid. prolix. "Related Words:..."
Ibid. prolix. "Related Words:..."
Prolixious. Dictionary.com. Webster's Revised Unabridged Dictionary. MICRA, Inc. http://dictionary.reference.com/browse/Prolixious(accessed: December 09, 2013).
sesquipedalian. Dictionary.com. Dictionary.com Unabridged. Random House, Inc. http://dictionary.reference.com/browse/sesquipedalian(accessed: December 09, 2013).

REFERENCES (RELATED TOPICS):

Pedantic. Answers. Answers.com Wiki Topics. Answers Corporation. pedantic(accessed: December 09, 2013).
Prolixity. Answers. Answers.com Wiki Topics. Answers Corporation. prolixity(accessed: December 09, 2013).

@QHereKidSF via Google Chrome on Windows 8.1

While the single-word term previous indicated as defining "a person that uses big words to make themselves seem smarter than [others]: a sesquipedalian" (cf. sesquipedalian: below; etc.) does correlate to the question at hand in its strictly limited relevance to the "use of big [or multi-syllabic] words," the term sesquipedalian does not in any way connote what presumably rests as that greater crux of the question at hand: that of making oneself feel or seem smarter than others, by use of uncommonly large and unfamiliar lexicon in common parlance.

"pedantic (over)-prolixity;" otherwise,...

"(over)-prolix pedant," or...

"prolixious pedantry"

pedant1

ped·ant / ˈpɛdnt / [IPA]

noun

1. a person who makes an excessive or inappropriate display of learning.

2. a person who overemphasizes rules or minor details.

3. a person who adheres rigidly to book knowledge without regard to common sense.

4. Obsolete . a schoolmaster.

Origin: 1580-90; < Italian pedante teacher, pedant; apparently akin to pedagogue; see -ant

Related forms:

ped·ant·esque, adjective

ped·ant·hood, noun

Synonyms:

2. hairsplitter.

Dictionary.com Unabridged (from Random House Dictionary), © Random House, Inc. 2013.

pedantic2

pe·dan·tic / pəˈdæntɪk / [IPA]

adjective

1. ostentatious in one's learning.

2. overly concerned with minute details or formalisms, especially in teaching.

Also, pe·dan·ti·cal.

Origin: 1590-1600; pedant + -ic

Related forms:

pe·dan·ti·cal·ly, adverb

pe·dan·ti·cal·ness, noun

sem·i·pe·dan·tic, adjective

sem·i·pe·dan·ti·cal, adjective

sem·i·pe·dan·ti·cal·ly, adverb

un·pe·dan·tic, adjective

un·pe·dan·ti·cal, adjective

Synonyms:

2. didactic, doctrinaire.

pedantry3

ped·ant·ry / ˈpɛdntri / [IPA (us)]

noun, pluralped·ant·ries.

1. the character, qualities, practices, etc., of a pedant, especially undue display of learning.

2. slavish attention to rules, details, etc.

3. an instance of being pedantic: the pedantries of modern criticism.

Origin: 1575-85; Italian pedanteria. See pedant, -ry

pedantry4 / ˈpɛd ə ntrɪ / [IPA (uk)] Collins - World English Dictionary

- n , pl-ries

the habit or an instance of being a pedant, esp in the display of useless knowledge or minute observance of petty rules or details

Collins English Dictionary - Complete & Unabridged 10th Edition 2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009.

prolix5

pro·lix / proʊˈlɪks, ˈproʊlɪks / [IPA]

adjective

1. extended to great, unnecessary, or tedious length; long and wordy.

2. (of a person) given to speaking or writing at great or tedious length.

Origin: 1375-1425; late Middle English < Latin prōlixus extended, long, equivalent to prō- [pro-1] + -lixus, akin to līquī to flow; see liquor

Related forms:

pro·lix·i·ty / proʊˈlɪksɪti / [IPA] , pro·lix·ness, noun

pro·lix·ly, adverb

[...]

o·ver·pro·lix, adjective6

[...]

o·ver·pro·lix·i·ty, noun7

un·pro·lix, adjective

Synonyms:

1. prolonged, protracted. See wordy. 1, 2. verbose.

Prolixious8

Pro*lix"ious\, a. Dilatory; tedious; superfluous. [Obs.] "Lay by all nicety, and prolixious blushes." --Shak.

The very first definitions (i.e., noun/adjectival,respectively; etc.) of the first two related words (i.e., pedant/pedantic, respectively; likewise) in this list of auto-indicative double-word phrases, defining "a person [who] uses big words to make [oneself] seem smarter than [others]," easily demonstrate -- with indubitably concrete clarity! -- just exactly how the previously suggested single-word term: sesquipedalian, greatly lacks in meanings for which words such as pedant, pedantic, and by extension, pedantry provide.

sesquipedalian9

ses·qui·pe·da·li·an / ˌsɛskwɪpɪˈdeɪliən, -ˈdeɪlyən / [IPA]

adjective Also, ses·quip·e·dal

1. given to using long words.

2. (of a word) containing many syllables.

noun

3. a sesquipedalian word. [...]

Respectfully submitted:

MATTHEW BLANCHARD (@QHereKidSF)

SAN FRANCISCO, CA 94109-7835 U.S.A.

User:QHereKidSF

ENDNOTES (SOURCES CITED):

pedant. Dictionary.com. Dictionary.com Unabridged. Random House, Inc. http://dictionary.reference.com/browse/pedant (accessed: December 09, 2013).
pedantic. Dictionary.com. Dictionary.com Unabridged. Random House, Inc. http://dictionary.reference.com/browse/pedantic (accessed: December 09, 2013).
pedantry. Dictionary.com. Dictionary.com Unabridged. Random House, Inc. http://dictionary.reference.com/browse/pedantry (accessed: December 09, 2013).
pedantry. Dictionary.com. Collins English Dictionary - Complete & Unabridged 10th Edition.HarperCollins Publishers. http://dictionary.reference.com/browse/pedantry (accessed: December 09, 2013).
prolix. Dictionary.com. Dictionary.com Unabridged. Random House, Inc. http://dictionary.reference.com/browse/prolix (accessed: December 09, 2013).
Ibid. prolix. "Related Words:..."
Ibid. prolix. "Related Words:..."
Prolixious. Dictionary.com. Webster's Revised Unabridged Dictionary. MICRA, Inc. http://dictionary.reference.com/browse/Prolixious (accessed: December 09, 2013).
sesquipedalian. Dictionary.com. Dictionary.com Unabridged. Random House, Inc. http://dictionary.reference.com/browse/sesquipedalian(accessed: December 09, 2013).

REFERENCES (RELATED TOPICS):

Pedantic. Answers. Answers.com Wiki Topics. Answers Corporation. pedantic(accessed: December 09, 2013).
Prolixity. Answers. Answers.com Wiki Topics. Answers Corporation. prolixity(accessed: December 09, 2013).

@QHereKidSF via Google Chrome on Windows 8.1

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