freedom fighter vs subverter

freedom fighter and subverter both are nouns.

Word	Noun	Adjective	Verb	Adverb
freedom fighter	Yes	No	No	No
subverter	Yes	No	No	No

As nouns, subverter is a hypernym of freedom fighter; that is, subverter is a word with a broader meaning than freedom fighter:

freedom fighter: a person who takes part in an armed rebellion against the constituted authority (especially in the hope of improving conditions)
subverter: a radical supporter of political or social revolution

Other hypernyms of freedom fighter include crusader, meliorist, reformer, reformist, social reformer, revolutionary, revolutionist, subversive.

freedom fighter (noun)	subverter (noun)
a person who takes part in an armed rebellion against the constituted authority (especially in the hope of improving conditions)	a radical supporter of political or social revolution