departure vs dispatch

departure and dispatch both are nouns.

Word	Noun	Adjective	Verb	Adverb
departure	Yes	No	No	No
dispatch	Yes	No	Yes	No

As nouns, dispatch is a hyponym of departure; that is, dispatch is a word with a more specific, narrower meaning than departure:

departure (noun)	dispatch (noun)
the act of departing	the act of sending off something
euphemistic expressions for death	killing a person or animal
a variation that deviates from the standard or norm	the property of being prompt and efficient
	an official report (usually sent in haste)

departure (verb)	dispatch (verb)
	kill without delay
	send away towards a designated goal
	complete or carry out
	kill intentionally and with premeditation
	dispose of rapidly and without delay and efficiently