saneness vs rationality

saneness and rationality both are nouns.

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

As nouns, rationality is a hyponym of saneness; that is, rationality is a word with a more specific, narrower meaning than saneness:

Other hyponyms of saneness include lucidity, reason, reasonableness.

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