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

vesper \ves"per\, a.
   of or pertaining to the evening, or to the service of
   vespers; as, a vesper hymn; vesper bells.
   1913 webster

   vesper sparrow, the grass finch. see under grass.
      1913 webster
see also:
vesper sparrow grass 

[2] : WordNet (r) 2.0

vesper sparrow
     n : common north american finch noted for its evening song syn:
          grass finch, pooecetes gramineus
see also:
grass finch pooecetes gramineus 

Vesper >> V Words
Vesper, definition of term: Vesper
vesper_pag1.html

Sparrow >> S Words
Sparrow, definition of term: Sparrow
sparrow_pag1.html