colloquialism vs peachy

colloquialism is a noun but peachy is not a noun.

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

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

colloquialism (adjective)	peachy (adjective)
	of something resembling a peach in color
	excellent