pettiness vs triviality

pettiness and triviality both are nouns.

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

As nouns, pettiness and triviality are synonyms defined as:

pettiness and triviality: the quality of being unimportant and petty or frivolous

Other synonyms of pettiness include puniness, slightness.

pettiness (noun)	triviality (noun)
the quality of being unimportant and petty or frivolous	something of small importance
lack of generosity in trifling matters	the quality of being unimportant and petty or frivolous
narrowness of mind or ideas or views	a detail that is considered insignificant