head honcho vs colloquialism

head honcho and colloquialism both are nouns.

Word	Noun	Adjective	Verb	Adverb
head honcho	Yes	No	No	No
colloquialism	Yes	No	No	No

head honcho (noun)	colloquialism (noun)
an important influential person	a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech