annihilationist

from The Collaborative International Dictionary of English v.0.48

Annihilationist \An*ni`hi*la"tion*ist\, n. (Theol.)
   One who believes that eternal punishment consists in
   annihilation or extinction of being; a destructionist.
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Destructionist \De*struc"tion*ist\, n.
   1. One who delights in destroying that which is valuable; one
      whose principles and influence tend to destroy existing
      institutions; a destructive.
      [1913 Webster]

   2. (Theol.) One who believes in the final destruction or
      complete annihilation of the wicked; -- called also
      {annihilationist}. --Shipley.
      [1913 Webster]