blahs vs colloquialism

blahs and colloquialism both are nouns.

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

blahs (noun)	colloquialism (noun)
a general feeling of boredom and dissatisfaction	a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech