empire vs imperial

empire and imperial both are nouns.

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

empire (noun)	imperial (noun)
a monarchy with an emperor as head of state	a piece of luggage carried on top of a coach
a group of countries under a single authority	a small tufted beard worn by Emperor Napoleon III
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

empire (adjective)	imperial (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