insaneness vs madness

insaneness and madness both are nouns.

Word	Noun	Adjective	Verb	Adverb
insaneness	Yes	No	No	No
madness	Yes	No	No	No

As nouns, insaneness and madness are synonyms defined as:

Other synonyms of insaneness include lunacy.

insaneness (noun)	madness (noun)
obsolete terms for legal insanity	unrestrained excitement or enthusiasm
	the quality of being rash and foolish
	a feeling of intense anger
	obsolete terms for legal insanity
	an acute viral disease of the nervous system of warm-blooded animals (usually transmitted by the bite of a rabid animal); rabies is fatal if the virus reaches the brain