charley horse vs colloquialism

charley horse and colloquialism both are nouns.

Word	Noun	Adjective	Verb	Adverb
charley horse	Yes	No	No	No
colloquialism	Yes	No	No	No

charley horse (noun)	colloquialism (noun)
a muscular cramp (especially in the thigh or calf) following vigorous exercise	a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech