avidity vs avidness

avidity and avidness both are nouns.

Word	Noun	Adjective	Verb	Adverb
avidity	Yes	No	No	No
avidness	Yes	No	No	No

As nouns, avidity and avidness are synonyms defined as:

avidity and avidness: a positive feeling of wanting to push ahead with something

Other synonyms of avidity include eagerness, keenness.

avidity (noun)	avidness (noun)
a positive feeling of wanting to push ahead with something	a positive feeling of wanting to push ahead with something