phantasmagorial
The phrase 'big words' is rather broad. Here are some examples:approachattachbatchbeachbelchbeseechbirchbitchbleachblowtorchbotchbreachbreechbrunchbunchbutterscotchcatchchurchcinchclutchcoachcockroachcornstarchcouchcrotchcrouchcrunchcrutchdebauchdispatchditchdrenchdutchencroacheunuchfetchflinchfrenchglitchhatchhitchhomestretchhunchhutchkeypunchlatchleechlunchlurchmarchmatchmatriarchmonarchmoochmulchmunchnonesuchnotchoutreachpatchpatriarchpeachperchpinchpitchpoachporchpouchpreachpunchreachreproachresearchsandwichscorchscotchscratchscrunchsketchslouchsnatchsnitchspeechstretchswatchswitchteachtorchtouchtwitchvouchwatchwenchwhichwitchworkbenchwrenchwretchwristwatchzilch
defenestrate: To throw out of a window.Enfenestrate: To throw in a window.So if you don't use this I am going to defenestrate you and the enfenestrate you.
An excessive fondness for or desire to use big words.
spacious
A "sesquipedalian".
bacteriologistbacteriotherapeuticballistocardiographbaresthesiometerbarocyclonometerbarothermohygrographbasicytoparaplastinbatrachomyomachybeautificationbenzalphenylhydrazonebenzofuroquinoxalinebenzophenanthrazinebenzophenanthrolinebenzophloroglucinolbenzoxyphenanthrenebioastronauticalbioclimatologiesbiodegradabilitybioelectricitiesbioenvironmentalbiologicohumanisticbioluminescencebiorhythmicitiesbiotechnologicalbipotentialitiesblabbermouthblepharoblennorrheablepharochromidrosisblepharoconjunctivitisblepharohematidrosisblepharosphincterectomyblepharosyndesmitisbloodhoundbloodthirstinessboroughmongeringbougainvilleabouillabaissebourgeoisiebrachiofaciolingualbrachycatalecticbrachycephalizationbronchoaspergillosisbronchoconstrictionbronchoesophagoscopybronchomucormycosisbronchopneumoniabronchopulmonarybureaucraticallybutterscotchBusinesslike, bloodthirstiness and bibliographically are big words.
big, huge, humongus
big words
Big is an adjective. Words that modify adjectives are called adverbs. Really is an adverb that can modify big.
Illness, Obsolete, SIckness or DIsorder
Some vocabulary words for a big field could include expanse, vastness, open space, or meadow.