expeditiousness vs celerity

expeditiousness and celerity both are nouns.

Word	Noun	Adjective	Verb	Adverb
expeditiousness	Yes	No	No	No
celerity	Yes	No	No	No

As nouns, celerity is a hypernym of expeditiousness; that is, celerity is a word with a broader meaning than expeditiousness:

Other hypernyms of expeditiousness include quickness, rapidity, rapidness, speediness.

expeditiousness (noun)	celerity (noun)
the property of being prompt and efficient	a rate that is rapid