despatch vs celerity

despatch and celerity both are nouns.

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

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

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

despatch (noun)	celerity (noun)
the act of sending off something	a rate that is rapid
killing a person or animal
the property of being prompt and efficient
an official report (usually sent in haste)

despatch (verb)	celerity (verb)
send away towards a designated goal