linguistics vs polyphonic

linguistics is a noun but polyphonic is not a noun.

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

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

linguistics (adjective)	polyphonic (adjective)
	having two or more independent but harmonically related melodic parts sounding together
	of or relating to or characterized by polyphony
	having two or more phonetic values