puniness vs pettiness

puniness and pettiness both are nouns.

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

As nouns, puniness and pettiness are synonyms defined as:

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

Other synonyms of puniness include slightness, triviality.

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