communism vs political theory

communism and political theory both are nouns.

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

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

communism: a political theory favoring collectivism in a classless society
political theory: an orientation that characterizes the thinking of a group or nation

Other hypernyms of communism include ideology, political orientation.

communism (noun)	political theory (noun)
a political theory favoring collectivism in a classless society	an orientation that characterizes the thinking of a group or nation
a form of socialism that abolishes private ownership