subverter

from WordNet (r) 3.0 (2006)

subverter
    n 1: a radical supporter of political or social revolution [syn:
         {revolutionist}, {revolutionary}, {subversive},
         {subverter}]

from The Collaborative International Dictionary of English v.0.48

Subverter \Sub*vert"er\, n.
   One who, or that which, subverts; an overthrower. --Sir T.
   More.
   [1913 Webster]

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