forever vs colloquialism

forever is not a noun while colloquialism is a noun.

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

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

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