See fanatic in Webster's New World Roget's A-Z Thesaurus II
noun
One who holds extreme views or advocates extreme measures:
extremist, radical, revolutionary, revolutionist, ultra, zealot. See edge, concern, politicsOne zealously devoted to a religion:
devotee, enthusiast, sectary, votary, zealot. See belief, love, religionA person who is ardently devoted to a particular subject or activity:
bug, devotee, enthusiast, maniac, zealot. (Informal) buff2, fan2, fiend. (Slang) freak, nut. See concern
adjective
Holding especially political views that deviate drastically and fundamentally from conventional or traditional beliefs:
extreme, extremist, fanatical, rabid, radical, revolutionary, ultra. (Slang) far-out. See concern, edge, politics
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