[1] : The Collaborative International Dictionary of English v.0.48

wren \wren\ re^n, n. oe. wrenne, as. wrenna, wraenna,
   perhaps akin to wr=aene lascivious.
   1913 webster
   1. zool. any one of numerous species of small singing birds
      belonging to troglodytes and numerous allied of the
      family troglodytidae.
      1913 webster

   note: among the species best known are the house wren
         troglodytes aedon common in both europe and
         america, and the american winter wren troglodytes
         hiemalis. see also cactus wren, marsh wren, and
         rock wren, under cactus, marsh, and rock.
         1913 webster

   2. zool. any one of numerous species of small singing birds
      more or less resembling the true wrens in size and habits.
      1913 webster

   note: among these are several species of european warblers;
         as, the reed wren see reed warbler
      a, under reed, the sedge wren see sedge warbler,
          under sedge, the willow wren see willow warbler,
          under willow, the golden-crested wren, and the
          ruby-crowned wren see kinglet.
          1913 webster

   ant wren, any one of numerous south american birds of the
      family formicaridae, allied to the ant thrushes.

   blue wren, a small australian singing bird malurus
      cyaneus, the male of which in the breeding season is
      bright blue. called also superb warbler.

   emu wren. see in the vocabulary.

   wren babbler, any one of numerous species of small timaline
      birds belonging to alcippe, stachyris, timalia, and
      several allied genera. these birds are common in southern
      asia and the east indies.

   wren tit. see ground wren, under ground.

   wren warbler, any one of several species of small asiatic
      and african singing birds belonging to prinia and allied
      genera. these birds are closely allied to the tailor
      birds, and build their nests in a similar manner. see also
      pincpinc.
      1913 webster
see also:
troglodytes troglodytidae troglodytes aedon troglodytes hiemalis cactus wren marsh wren 
rock wren cactus marsh rock reed warbler 
reed sedge warbler sedge willow warbler willow 
kinglet ant wren formicaridae blue wren malurus cyaneus 
superb warbler emu wren wren babbler alcippe stachyris 
timalia wren tit ground wren ground wren warbler 
prinia pincpinc 

[2] : WordNet (r) 2.0

wren warbler
     n : small asiatic and african bird; constructs nests like those
         of tailorbirds

Wren >> W Words
Wren, definition of term: Wren
wren_pag1.html

Warbler >> W Words
Warbler, definition of term: Warbler
warbler_pag1.html

Jenny Wren >> J Words
Jenny Wren, definition of term: Jenny Wren
jenny+wren_pag1.html

Cactus Wren >> C Words
Cactus Wren, definition of term: Cactus Wren
cactus+wren_pag1.html