imperialism vs political theory

imperialism and political theory both are nouns.

Word	Noun	Adjective	Verb	Adverb
imperialism	Yes	No	No	No
political theory	Yes	No	No	No

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

imperialism: a political orientation that advocates imperial interests
political theory: an orientation that characterizes the thinking of a group or nation

Other hypernyms of imperialism include ideology, political orientation.

imperialism (noun)	political theory (noun)
any instance of aggressive extension of authority	an orientation that characterizes the thinking of a group or nation
a political orientation that advocates imperial interests
a policy of extending your rule over foreign countries