| zealot(noun, religion, person, love, concern) |
| fiend(noun, activity, concern, interest, informal) |
| enthusiast(noun, religion, love, concern, interest) |
| devotee(noun, religion, love, concern, interest) |
| extremist(noun, adjective, person, concern, interest) |
| radical(noun, adjective, person, concern, interest) |
| freak(noun, person, concern, slang, interest) |
| nut(noun, character, concern, slang, interest) |
| fan(noun, concern, informal, nut, supporter) |
| extreme(adjective, concern, keen, passionate, enthusiastic) |
| maniac(noun, person, concern, interest, crazy) |
| fanatical(adjective, concern, keen, passionate, enthusiastic) |
| sectarian(noun, adjective, person, sympathetic, exclusive) |
| bigot(noun, person, interest, crazy, radical) |
| crazy(noun, adjective, interest, radical, cuckoo) |
| rabid(adjective, concern, keen, passionate, enthusiastic) |
| addict(noun, person, interest, nut, supporter) |
| bigoted(adjective, sympathetic, fervent, discrimination, zealous) |
| bug(noun, concern, interest, informal, nut) |
| puritan(noun, attitude, behavior, sexual moral, sexual activity) |