like crazy vs colloquialism

like crazy is not a noun while colloquialism is a noun.

Word	Noun	Adjective	Verb	Adverb
like crazy	No	No	No	Yes
colloquialism	Yes	No	No	No

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

like crazy (adverb)	colloquialism (adverb)
(informal) with great speed or effort or intensity; used for emphasis