The Collaborative International Dictionary of English v.0.48:

Copse \Copse\, n. [Contr. from coppice.]
   A wood of small growth; a thicket of brushwood. See
   Coppice.
   [1913 Webster]

         Near yonder copse where once the garden smiled.
                                                  --Goldsmith.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Copse \Copse\, v. t.
   1. To trim or cut; -- said of small trees, brushwood, tufts
      of grass, etc. --Halliwell.
      [1913 Webster]

   2. To plant and preserve, as a copse. --Swift.
      [1913 Webster]

WordNet (r) 3.0 (2006):

copse
    n 1: a dense growth of bushes [syn: brush, brushwood,
         coppice, copse, thicket]

Moby Thesaurus II by Grady Ward, 1.0:

43 Moby Thesaurus words for "copse":
   batch, bocage, boscage, bosk, bosket, brake, bunch, canebrake,
   ceja, chamisal, chaparral, clump, cluster, coppice, copsewood,
   covert, crop, frith, group, grouping, groupment, grove, hassock,
   holt, hurst, knot, lot, mess, motte, orchard, shaw, shock, slew,
   spinney, stook, thicket, thickset, tope, tuft, tussock, wisp,
   wood lot, woodlet