zeal vs avidness

zeal and avidness both are nouns.

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

As nouns, avidness is a hypernym of zeal; that is, avidness is a word with a broader meaning than zeal:

Other hypernyms of zeal include avidity, eagerness, keenness.

zeal (noun)	avidness (noun)
prompt willingness	a positive feeling of wanting to push ahead with something
a feeling of strong eagerness (usually in favor of a person or cause)
excessive fervor to do something or accomplish some end