| radical(noun, adjective, person, concern, belief) |
| zealot(noun, person, right, concern, belief) |
| fanatic(noun, adjective, person, concern, interest) |
| revolutionary(noun, adjective, person, concern, belief) |
| ultra(noun, adjective, person, concern, belief) |
| extreme(adjective, concern, enthusiastic, ill, sick) |
| immoderate(noun, adjective, extreme) |
| revolutionist(noun, person, concern, belief, edge) |
| rabid(adjective, concern, violent, ill, extreme) |
| agitator(noun, belief, radical, rebel, progressive) |
| militant(noun, adjective, radical, thorough, rebel) |
| ultraist(noun, adjective, belief, enthusiastic, ill) |
| bigot(noun, person, radical, conservative, partisan) |
| excessive(adjective, extreme) |
| fanatical(adjective, concern, enthusiastic, ill, extreme) |
| sectarian(noun, person, radical, fanatic, partisan) |
| die-hard(noun, adjective, belief, uncompromising, holder of extreme views) |
| enthusiast(noun, radical, fanatic, intolerant, freak) |
| maverick(noun, person, radical, rebel, eccentric) |
| reformer(noun, rebel, fanatic, progressive, revolutionary) |