The Collaborative International Dictionary of English v.0.48:

Scaup \Scaup\ (sk[add]p), n. [See Scalp a bed of oysters or
   mussels.]
   1. A bed or stratum of shellfish; scalp. [Scot.]
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   2. (Zool.) A scaup duck. See below.
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   Scaup duck (Zool.), any one of several species of northern
      ducks of the genus Aythya, or Fuligula. The adult
      males are, in large part, black. The three North American
      species are: the greater scaup duck (Aythya marila, var.
      nearctica), called also broadbill, bluebill,
      blackhead, flock duck, flocking fowl, and raft
      duck; the lesser scaup duck (Aythya affinis), called
      also little bluebill, river broadbill, and shuffler;
      the tufted, or ring-necked, scaup duck (Aythya
      collaris), called also black jack, ringneck,
      ringbill, ringbill shuffler, etc. See Illust. of
      Ring-necked duck, under Ring-necked. The common
      European scaup, or mussel, duck (Aythya marila), closely
      resembles the American variety.
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The Collaborative International Dictionary of English v.0.48:

Raft \Raft\, n. [Originally, a rafter, spar, and fr. Icel. raptr
   a rafter; akin to Dan. raft, Prov. G. raff a rafter, spar;
   cf. OHG. r[=a]fo, r[=a]vo, a beam, rafter, Icel. r[=a]f roof.
   Cf. Rafter, n.]
   1. A collection of logs, boards, pieces of timber, or the
      like, fastened together, either for their own collective
      conveyance on the water, or to serve as a support in
      conveying other things; a float.
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   2. A collection of logs, fallen trees, etc. (such as is
      formed in some Western rivers of the United States), which
      obstructs navigation. [U.S.]
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   3. [Perhaps akin to raff a heap.] A large collection of
      people or things taken indiscriminately. [Slang, U. S.] "A
      whole raft of folks." --W. D. Howells.
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   Raft bridge.
      (a) A bridge whose points of support are rafts.
      (b) A bridge that consists of floating timbers fastened
          together.

   Raft duck. [The name alludes to its swimming in dense
      flocks.] (Zool.)
      (a) The bluebill, or greater scaup duck; -- called also
          flock duck. See Scaup.
      (b) The redhead.

   Raft port (Naut.), a large, square port in a vessel's side
      for loading or unloading timber or other bulky articles; a
      timber or lumber port.
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The Collaborative International Dictionary of English v.0.48:

Broadbill \Broad"bill`\, n.
   1. (Zool.) A wild duck (Aythya marila, or Fuligula
      marila), which appears in large numbers on the eastern
      coast of the United States, in autumn; -- called also
      bluebill, blackhead, raft duck, and scaup duck.
      See Scaup duck.
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   2. (Zool.) The shoveler. See Shoveler.
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