triviality vs small beer

triviality and small beer both are nouns.

Word	Noun	Adjective	Verb	Adverb
triviality	Yes	No	No	No
small beer	Yes	No	No	No

As nouns, triviality and small beer are synonyms defined as:

Other synonyms of triviality include trifle, trivia.

triviality (noun)	small beer (noun)
something of small importance	something of small importance
the quality of being unimportant and petty or frivolous
a detail that is considered insignificant