The Collaborative International Dictionary of English v.0.48:

Buccaneer \Buc`ca*neer"\, v. i.
   To act the part of a buccaneer; to live as a piratical
   adventurer or sea robber.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Buccaneer \Buc`ca*neer"\, n. [F. boucanier, fr. boucaner to
   smoke or broil meat and fish, to hunt wild beasts for their
   skins, boucan a smoking place for meat or fish, gridiron for
   smoking: a word of American origin.]
   A robber upon the sea; a pirate; -- a term applied especially
   to the piratical adventurers who made depredations on the
   Spaniards in America in the 17th and 18th centuries. [Written
   also bucanier.]
   [1913 Webster]

   Note: Primarily, one who dries and smokes flesh or fish after
         the manner of the Indians. The name was first given to
         the French settlers in Haiti or Hispaniola, whose
         business was to hunt wild cattle and swine.
         [1913 Webster]

WordNet (r) 3.0 (2006):

buccaneer
    n 1: someone who robs at sea or plunders the land from the sea
         without having a commission from any sovereign nation [syn:
         pirate, buccaneer, sea robber, sea rover]
    v 1: live like a buccaneer

Moby Thesaurus II by Grady Ward, 1.0:

56 Moby Thesaurus words for "buccaneer":
   AB, Ancient Mariner, Argonaut, Blackbeard, Captain Hook,
   Captain Kidd, Dylan, Flying Dutchman, Henry Morgan, Jean Lafitte,
   Neptune, OD, Poseidon, Varuna, able seaman, able-bodied seaman,
   air pirate, airplane hijacker, bluejacket, corsair, deep-sea man,
   fair-weather sailor, fisherman, freebooter, hearty, jack,
   jack afloat, jack-tar, jacky, limey, lobsterman, mariner, matelot,
   navigator, picaroon, pirate, privateer, rover, sailor, salt,
   sea dog, sea king, sea robber, sea rover, sea wolf, seafarer,
   seafaring man, seaman, shipman, skyjacker, tar, viking, water dog,
   whaler, windjammer, windsailor