imperial vs empire

imperial and empire both are nouns.

Word	Noun	Adjective	Verb	Adverb
imperial	Yes	Yes	No	No
empire	Yes	No	No	No

imperial (noun)	empire (noun)
a piece of luggage carried on top of a coach	a monarchy with an emperor as head of state
a small tufted beard worn by Emperor Napoleon III	a group of countries under a single authority
	a group of diverse companies under common ownership and run as a single organization
	the domain ruled by an emperor or empress; the region over which imperial dominion is exercised

imperial (adjective)	empire (adjective)
befitting or belonging to an emperor or empress
relating to or associated with an empire
of or belonging to the British Imperial System of weights and measures
belonging to or befitting a supreme ruler