extremist (n.)
- agitator
- anarchist
- brawler
- extreme
- fanatic
- haggard
- insurgent
- insurrectionist
- irrational
- malcontent
- maverick
- meliorist
- mutineer
- nihilist
- nonconformist
- pink
- pinko
- progressive
- radical
- rebel
- red
- reformer
- reformist
- revisionist
- revolutionary
- revolutionist
- rioter
- subversive
- syndicalist
- traitor
- ultra
- ultraconservative
- utopian
extremist (adj.)
- anarchistic
- bigoted
- extravagant
- extreme
- fanatic
- haggard
- inordinate
- insubordinate
- insurgent
- insurrectionary
- irrational
- malcontent
- maverick
- nihilistic
- nonconformist
- overenthusiastic
- overzealous
- perfervid
- pink
- progressive
- rabid
- radical
- red
- reformist
- revolutionary
- subversive
- ultra
- ultraconservative
- unreasonable
- utopian
- wild-eyed
