prehistoric vs colloquialism

prehistoric is not a noun while colloquialism is a noun.

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

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

prehistoric (adjective)	colloquialism (adjective)
of or relating to times before written history
belonging to or existing in times before recorded history
outdated