colloquialism vs primo

colloquialism and primo both are nouns.

Word	Noun	Adjective	Verb	Adverb
colloquialism	Yes	No	No	No
primo	Yes	Yes	No	No

colloquialism (noun)	primo (noun)
a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech	the principal part of a duet (especially a piano duet)

colloquialism (adjective)	primo (adjective)
	the best of its kind