imperial vs emperor

imperial and emperor both are nouns.

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

imperial (noun)	emperor (noun)
a piece of luggage carried on top of a coach	large richly colored butterfly
a small tufted beard worn by Emperor Napoleon III	large moth of temperate forests of Eurasia having heavily scaled transparent wings
	red table grape of California
	the male ruler of an empire

imperial (adjective)	emperor (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