colloquialism vs sourpuss

colloquialism and sourpuss both are nouns.

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

colloquialism (noun)	sourpuss (noun)
a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech	someone with a habitually sullen or gloomy expression