ardour vs avidity

ardour and avidity both are nouns.

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

As nouns, avidity is a hypernym of ardour; that is, avidity is a word with a broader meaning than ardour:

ardour: a feeling of strong eagerness (usually in favor of a person or cause)
avidity: a positive feeling of wanting to push ahead with something

Other hypernyms of ardour include avidness, eagerness, keenness.

ardour (noun)	avidity (noun)
intense feeling of love	a positive feeling of wanting to push ahead with something
a feeling of strong eagerness (usually in favor of a person or cause)
feelings of great warmth and intensity