retroflex vs linguistics

retroflex is not a noun while linguistics is a noun.

Word	Noun	Adjective	Verb	Adverb
retroflex	No	Yes	Yes	No
linguistics	Yes	No	No	No

retroflex (noun)	linguistics (noun)
	the scientific study of language
	the humanistic study of language and literature

retroflex (adjective)	linguistics (adjective)
bent or curved backward
pronounced with the tip of the tongue turned back toward the hard palate

retroflex (verb)	linguistics (verb)
articulate (a consonant) with the tongue curled back against the palate
bend or turn backward