enthusiasm vs madness

enthusiasm and madness both are nouns.

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

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

Other hyponyms of enthusiasm include lyricism, rabidity, rabidness.

enthusiasm (noun)	madness (noun)
overflowing with eager enjoyment or approval	unrestrained excitement or enthusiasm
a lively interest	the quality of being rash and foolish
a feeling of excitement	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