colloquialism vs washout

colloquialism and washout both are nouns.

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

colloquialism (noun)	washout (noun)
a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech	someone who is unsuccessful
	the erosive process of washing away soil or gravel by water (as from a roadway)
	the channel or break produced by erosion of relatively soft soil by water