The Collaborative International Dictionary of English v.0.48:

Willet \Wil"let\, n. (Zool.)
   A large North American snipe (Symphemia semipalmata); --
   called also pill-willet, will-willet, semipalmated
   tattler, or snipe, duck snipe, and stone curlew.
   [1913 Webster]

   Carolina willet, the Hudsonian godwit.
      [1913 Webster]

WordNet (r) 3.0 (2006):

willet
    n 1: large North American shorebird of eastern and Gulf Coasts
         [syn: willet, Catoptrophorus semipalmatus]