keenness vs enthusiasm

keenness and enthusiasm both are nouns.

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

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

keenness (noun)	enthusiasm (noun)
thinness of edge or fineness of point	overflowing with eager enjoyment or approval
a quick and penetrating intelligence	a lively interest
a positive feeling of wanting to push ahead with something	a feeling of excitement