Capitalization is a noun.
Capital letters are used for a number of categories:
a. For the initial letter of the first word at the start of a sentence
b. The initial letter of a proper noun
c. In abbreviations of names eg BT for British Telecomm
d. For a whole word which you wish to EMPHASIZE
part of speech
Adjective
What part of speech is thaw
The part of speech for oscillate is verb.
An adjective is a part of speech.
The directions -- north, east, south, west, and their combinations -- can be either adverbs or adjectives, and with capitalization, can also be proper nouns.
The part of speech for this particular word is a noun.
part of speech
The part of speech for "answer" is a noun.
adverb
what part of speech is beneath
Proper capitalization is an important part of English grammar. Many websites offer information about the rules of grammar, such as Webgrammar, GrammarBook, and Grammarly. Any decent grammar textbook should also have information about capitalization.
The correct capitalization for "commonwealth" depends on how it is used. If it is part of a specific name, like "Commonwealth of Pennsylvania," then it is capitalized. Otherwise, if referring to a generic political community, it is lowercased.
The part of speech for "unfamiliar" is an adjective.
The part of speech of "came" is a verb.
The part of speech for "twirl" is a verb.
The part of speech for "explicit" is an adjective.