deputy vs vicegerent

deputy and vicegerent both are nouns.

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

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

deputy (noun)	vicegerent (noun)
an assistant with power to act when his superior is absent	someone appointed by a ruler as an administrative deputy
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)