enthusiasm vs rabidness

enthusiasm and rabidness both are nouns.

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

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

Other hyponyms of enthusiasm include lyricism, madness, rabidity.

enthusiasm (noun)	rabidness (noun)
overflowing with eager enjoyment or approval	unrestrained excitement or enthusiasm
a lively interest
a feeling of excitement