petiteness vs tininess

petiteness and tininess both are nouns.

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

As nouns, petiteness and tininess are synonyms defined as:

Other synonyms of petiteness include diminutiveness, minuteness, weeness.

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