buddy-buddy vs colloquialism

buddy-buddy is not a noun while colloquialism is a noun.

Word	Noun	Adjective	Verb	Adverb
buddy-buddy	No	Yes	No	No
colloquialism	Yes	No	No	No

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

buddy-buddy (adjective)	colloquialism (adjective)
(used informally) associated on close terms