linguistics vs cacuminal

linguistics is a noun but cacuminal is not a noun.

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

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

linguistics (adjective)	cacuminal (adjective)
	pronounced with the tip of the tongue turned back toward the hard palate