colloquialism vs head honcho

colloquialism and head honcho both are nouns.

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

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