slay vs dispatch

slay is not a noun while dispatch is a noun.

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

As verbs, slay and dispatch are synonyms defined as:

Other synonyms of slay include bump off, hit, murder, off, polish off, remove.

slay (noun)	dispatch (noun)
	the act of sending off something
	killing a person or animal
	the property of being prompt and efficient
	an official report (usually sent in haste)

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