tininess vs petiteness

tininess and petiteness both are nouns.

Word	Noun	Adjective	Verb	Adverb
tininess	Yes	No	No	No
petiteness	Yes	No	No	No

As nouns, tininess and petiteness are synonyms defined as:

Other synonyms of tininess include diminutiveness, minuteness, weeness.

tininess (noun)	petiteness (noun)
the property of being very small in size	the property of being very small in size