reason vs sanity

reason and sanity both are nouns.

Word	Noun	Adjective	Verb	Adverb
reason	Yes	No	Yes	No
sanity	Yes	No	No	No

As nouns, sanity is a hypernym of reason; that is, sanity is a word with a broader meaning than reason:

Other hypernyms of reason include saneness.

reason (noun)	sanity (noun)
the capacity for rational thought or inference or discrimination	normal or sound powers of mind
a fact that logically justifies some premise or conclusion
a justification for something existing or happening
an explanation of the cause of some phenomenon
a rational motive for a belief or action
the state of having good sense and sound judgment

reason (verb)	sanity (verb)
think logically
decide by reasoning; draw or come to a conclusion
present reasons and arguments