promptness vs celerity

promptness and celerity both are nouns.

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

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

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

promptness (noun)	celerity (noun)
the characteristic of doing things without delay	a rate that is rapid
the quality or habit of adhering to an appointed time