knower

from WordNet (r) 3.0 (2006)
knower
    n 1: a person who knows or apprehends [syn: {knower},
         {apprehender}]
from The Collaborative International Dictionary of English v.0.48
Knower \Know"er\, n.
   One who knows. --Shak.
   [1913 Webster] knowhow
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