triviality vs bagatelle

triviality and bagatelle both are nouns.

Word	Noun	Adjective	Verb	Adverb
triviality	Yes	No	No	No
bagatelle	Yes	No	No	No

As nouns, bagatelle is a hyponym of triviality; that is, bagatelle is a word with a more specific, narrower meaning than triviality:

Other hyponyms of triviality include fluff, frippery, frivolity.

triviality (noun)	bagatelle (noun)
something of small importance	a table game in which short cues are used to knock balls into holes that are guarded by wooden pegs; penalties are incurred if the pegs are knocked over
the quality of being unimportant and petty or frivolous	something of little value or significance
a detail that is considered insignificant	a light piece of music for piano