radicalism vs political theory

radicalism and political theory both are nouns.

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

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

radicalism: the political orientation of those who favor revolutionary change in government and society
political theory: an orientation that characterizes the thinking of a group or nation

Other hypernyms of radicalism include ideology, political orientation.

radicalism (noun)	political theory (noun)
the political orientation of those who favor revolutionary change in government and society	an orientation that characterizes the thinking of a group or nation