bagatelle vs trivia

bagatelle and trivia both are nouns.

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

As nouns, trivia is a hypernym of bagatelle; that is, trivia is a word with a broader meaning than bagatelle:

Other hypernyms of bagatelle include small beer, trifle, triviality.

bagatelle (noun)	trivia (noun)
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	something of small importance
something of little value or significance
a light piece of music for piano