pettiness vs smallness

pettiness and smallness both are nouns.

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

As nouns, pettiness and smallness are synonyms defined as:

Other synonyms of pettiness include littleness.

pettiness (noun)	smallness (noun)
the quality of being unimportant and petty or frivolous	the property of having a relatively small size
lack of generosity in trifling matters	lack of generosity in trifling matters
narrowness of mind or ideas or views	the property of being a relatively small amount
	the property of having relatively little strength or vigor
	The quality of being minor in influence, power, or rank.