smallness vs pettiness

smallness and pettiness both are nouns.

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

As nouns, smallness and pettiness are synonyms defined as:

Other synonyms of smallness include littleness.

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