topnotch vs colloquialism

topnotch is not a noun while colloquialism is a noun.

Word	Noun	Adjective	Verb	Adverb
topnotch	No	Yes	No	No
colloquialism	Yes	No	No	No

topnotch (noun)	colloquialism (noun)
	a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech

topnotch (adjective)	colloquialism (adjective)
of the highest quality