zeal vs keenness

zeal and keenness both are nouns.

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

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

Other hypernyms of zeal include avidity, avidness, eagerness.

zeal (noun)	keenness (noun)
prompt willingness	thinness of edge or fineness of point
a feeling of strong eagerness (usually in favor of a person or cause)	a quick and penetrating intelligence
excessive fervor to do something or accomplish some end	a positive feeling of wanting to push ahead with something