homophonous vs linguistics

homophonous is not a noun while linguistics is a noun.

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

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

homophonous (adjective)	linguistics (adjective)
characteristic of the phenomenon of words of different origins that are pronounced the same way