deputise vs deputy

deputise is not a noun while deputy is a noun.

Word	Noun	Adjective	Verb	Adverb
deputise	No	No	Yes	No
deputy	Yes	No	No	No

deputise (noun)	deputy (noun)
	an assistant with power to act when his superior is absent
	someone authorized to exercise the powers of sheriff in emergencies
	a person appointed to represent or act on behalf of others
	a member of the lower chamber of a legislative assembly (such as in France)

deputise (verb)	deputy (verb)
appoint as a substitute
act as a substitute