rational vs sane

rational is a noun but sane is not a noun.

Word	Noun	Adjective	Verb	Adverb
rational	Yes	Yes	No	No
sane	No	Yes	No	No

rational (noun)	sane (noun)
an integer or a fraction

rational (adjective)	sane (adjective)
consistent with or based on or using reason	mentally healthy; free from mental disorder
capable of being expressed as a quotient of integers	marked by sound judgment; having good reason
having its source in or being guided by the intellect (as distinguished from experience or emotion)
of or associated with or requiring the use of the mind