colloquialism vs forever

colloquialism is a noun but forever is not a noun.

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

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

colloquialism (adverb)	forever (adverb)
	for a limitless time
	for a very long or seemingly endless time
	invariably