colloquialism vs hot under the collar

colloquialism is a noun but hot under the collar is not a noun.

Word	Noun	Adjective	Verb	Adverb
colloquialism	Yes	No	No	No
hot under the collar	No	Yes	No	No

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

colloquialism (adjective)	hot under the collar (adjective)
	very angry