tininess vs weeness

tininess and weeness both are nouns.

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

As nouns, tininess and weeness are synonyms defined as:

Other synonyms of tininess include diminutiveness, minuteness, petiteness.

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