powerable

from The Collaborative International Dictionary of English v.0.48

Powerable \Pow"er*a*ble\, a.
   1. Capable of being effected or accomplished by the
      application of power; possible. [R.] --J. Young.
      [1913 Webster]

   2. Capable of exerting power; powerful. --Camden.
      [1913 Webster] power dive