mouthpiece vs colloquialism

mouthpiece and colloquialism both are nouns.

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

mouthpiece (noun)	colloquialism (noun)
the aperture of a wind instrument into which the player blows directly	a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech
the tube of a pipe or cigarette holder that a smoker holds in the mouth
an acoustic device; the part of a telephone into which a person speaks
(especially boxing) equipment that protects an athlete's mouth
a part that goes over or into the mouth of a person
a spokesperson (as a lawyer)