The Collaborative International Dictionary of English v.0.48:

Pussy \Pussy\, n. [Dim. of puss.]
   1. A pet name for a cat; also, an endearing name for a girl.
      [1913 Webster]

   2. A catkin of the pussy willow.
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   3. The game of tipcat; -- also called pussy cat.
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   Pussy willow (Bot.), any kind of willow having large
      cylindrical catkins clothed with long glossy hairs,
      especially the American Salix discolor; -- called also
      glaucous willow, and swamp willow.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Swamp \Swamp\, n. [Cf. AS. swam a fungus, OD. swam a sponge, D.
   zwam a fungus, G. schwamm a sponge, Icel. sv["o]ppr, Dan. &
   Sw. swamp, Goth. swamms, Gr. somfo`s porous, spongy.]
   Wet, spongy land; soft, low ground saturated with water, but
   not usually covered with it; marshy ground away from the
   seashore.
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         Gray swamps and pools, waste places of the hern.
                                                  --Tennyson.
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         A swamp differs from a bog and a marsh in producing
         trees and shrubs, while the latter produce only
         herbage, plants, and mosses.             --Farming
                                                  Encyc. (E.
                                                  Edwards,
                                                  Words).
   [1913 Webster]

   Swamp blackbird. (Zool.) See Redwing
   (b) .

   Swamp cabbage (Bot.), skunk cabbage.

   Swamp deer (Zool.), an Asiatic deer (Rucervus Duvaucelli)
      of India.

   Swamp hen. (Zool.)
   (a) An Australian azure-breasted bird (Porphyrio bellus);
       -- called also goollema.
   (b) An Australian water crake, or rail (Porzana Tabuensis);
       -- called also little swamp hen.
   (c) The European purple gallinule.

   Swamp honeysuckle (Bot.), an American shrub (Azalea
      viscosa syn. Rhododendron viscosa or Rhododendron
      viscosum) growing in swampy places, with fragrant flowers
      of a white color, or white tinged with rose; -- called
      also swamp pink and white swamp honeysuckle.

   Swamp hook, a hook and chain used by lumbermen in handling
      logs. Cf. Cant hook.

   Swamp itch. (Med.) See Prairie itch, under Prairie.

   Swamp laurel (Bot.), a shrub (Kalmia glauca) having small
      leaves with the lower surface glaucous.

   Swamp maple (Bot.), red maple. See Maple.

   Swamp oak (Bot.), a name given to several kinds of oak
      which grow in swampy places, as swamp Spanish oak
      (Quercus palustris), swamp white oak (Quercus
      bicolor), swamp post oak (Quercus lyrata).

   Swamp ore (Min.), bog ore; limonite.

   Swamp partridge (Zool.), any one of several Australian game
      birds of the genera Synoicus and Excalfatoria, allied
      to the European partridges.

   Swamp robin (Zool.), the chewink.

   Swamp sassafras (Bot.), a small North American tree of the
      genus Magnolia (Magnolia glauca) with aromatic leaves
      and fragrant creamy-white blossoms; -- called also sweet
      bay.

   Swamp sparrow (Zool.), a common North American sparrow
      (Melospiza Georgiana, or Melospiza palustris), closely
      resembling the song sparrow. It lives in low, swampy
      places.

   Swamp willow. (Bot.) See Pussy willow, under Pussy.
      [1913 Webster]

WordNet (r) 3.0 (2006):

swamp willow
    n 1: North American shrubby willow having dark bark and linear
         leaves growing close to streams and lakes [syn: swamp
         willow, black willow, Salix nigra]