Militant
Part of speech: adjective
Definition: aggressive or combative fighting or warlike; belligerent Active in an aggressive way in support of a political or social cause (often associated with extreme left-wing politics).
Part of speech: noun
Definition: An aggressive or fighting person. One who serves as a soldier. One who supports a Trotskyite political view or engages in aggressive left-wing politics.
Example sentence: If you like small government you need to work hard at having a strong national defense that is not so militant. Personal liberty is the purpose of government, to protect liberty - not to run your personal life, not to run the economy, and not to pretend that we can tell the world how they ought to live.
Activist
Part of speech: noun
Definition: one who is politically active in the role of a citizen; especially, one who campaigns for changeone who is conspicuously more active in carrying out any occupational or professional functions.
Example sentence: I didn't wake up and decide to become an activist. But you couldn't help notice the inequities, the injustices. It was all around you.