rationality vs rationalness

rationality and rationalness both are nouns.

Word	Noun	Adjective	Verb	Adverb
rationality	Yes	No	No	No
rationalness	Yes	No	No	No

As nouns, rationality and rationalness are synonyms defined as:

rationality and rationalness: the quality of being consistent with or based on logic

rationality (noun)	rationalness (noun)
the quality of being consistent with or based on logic	the quality of being consistent with or based on logic
the state of having good sense and sound judgment