pettiness vs puniness

pettiness and puniness both are nouns.

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

As nouns, pettiness and puniness are synonyms defined as:

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

Other synonyms of pettiness include slightness, triviality.

pettiness (noun)	puniness (noun)
the quality of being unimportant and petty or frivolous	smallness of stature
lack of generosity in trifling matters	the quality of being unimportant and petty or frivolous
narrowness of mind or ideas or views