eagerness vs enthusiasm

eagerness and enthusiasm both are nouns.

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

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

eagerness (noun)	enthusiasm (noun)
prompt willingness	overflowing with eager enjoyment or approval
a positive feeling of wanting to push ahead with something	a lively interest
	a feeling of excitement