lunatic vs colloquialism

lunatic and colloquialism both are nouns.

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

lunatic (noun)	colloquialism (noun)
an insane person	a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech
a reckless impetuous irresponsible person

lunatic (adjective)	colloquialism (adjective)
insane and believed to be affected by the phases of the moon