rationalness vs rationality

rationalness and rationality both are nouns.

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

As nouns, rationalness and rationality are synonyms defined as:

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

rationalness (noun)	rationality (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