weeness vs petiteness

weeness and petiteness both are nouns.

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

As nouns, weeness and petiteness are synonyms defined as:

Other synonyms of weeness include diminutiveness, minuteness, tininess.

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