Synonyms of extremist in English:

extremist


See US English definition of extremist

See UK English definition of extremist

See Spanish definition of extremista

noun

1‘with little to gain from moderation, the extremists rule the day’

SYNONYMS
fanatic, radical, zealot, fundamentalist, hardliner, dogmatist, bigot, diehard, militant, activist
sectarian, chauvinist, partisan
informal ultra, maniac, crank
ANTONYMS

moderate