imperialism vs foreign policy

imperialism and foreign policy both are nouns.

Word	Noun	Adjective	Verb	Adverb
imperialism	Yes	No	No	No
foreign policy	Yes	No	No	No

As nouns, foreign policy is a hypernym of imperialism; that is, foreign policy is a word with a broader meaning than imperialism:

imperialism (noun)	foreign policy (noun)
any instance of aggressive extension of authority	a policy governing international relations
a political orientation that advocates imperial interests
a policy of extending your rule over foreign countries