rightness vs justness

rightness and justness both are nouns.

Word	Noun	Adjective	Verb	Adverb
rightness	Yes	No	No	No
justness	Yes	No	No	No

As nouns, rightness and justness are synonyms defined as:

rightness and justness: conformity with some esthetic standard of correctness or propriety

Other synonyms of rightness include nicety.

rightness (noun)	justness (noun)
according with conscience or morality	the quality of being just or fair
conformity to fact or truth	conformity with some esthetic standard of correctness or propriety
appropriate conduct; doing the right thing
conformity with some esthetic standard of correctness or propriety