rabidness vs rabidity

rabidness and rabidity both are nouns.

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

As nouns, rabidness and rabidity are synonyms defined as:

Other synonyms of rabidness include madness.

rabidness (noun)	rabidity (noun)
unrestrained excitement or enthusiasm	unrestrained excitement or enthusiasm
	The property of being very extreme, unreasonable, or fanatical in opinion; excessively zealous; comparable to one with rabies.