fanatic — OET

fanatic

noun

1 a religious fanatic:

zealot, extremist, militant, dogmatist, devotee, sectarian, bigot, chauvinist, partisan, radical, diehard, ultra, activist, apologist, adherent;

visionary;

informal maniac, crank, freak;

US, informal wackadoo, wackadoodle.

▷antonyms moderate.

2 informal a keep-fit fanatic:

enthusiast, fan, devotee, lover, addict;

informal nut, maniac, fiend, freak, junkie, bug, crank, buff, -head, a great one for;

North American, informal geek, jock.

fanatic Oxford Dictionary of English