The Collaborative International Dictionary of English v.0.48:

fingerboard \fingerboard\ n.
   1. a guidepost resembling a hand with a pointing index
      finger.

   Syn: fingerpost.
        [WordNet 1.5]

   2. a bank of keys on a musical instrument.

   Syn: piano keyboard, clavier.
        [WordNet 1.5]

   3. a narrow strip of wood on the neck of some stringed
      instruments (violin or cello or guitar etc) where the
      strings are held against the wood with the fingers.
      [WordNet 1.5]

WordNet (r) 3.0 (2006):

fingerboard
    n 1: a guidepost resembling a hand with a pointing index finger
         [syn: fingerpost, fingerboard]
    2: a bank of keys on a musical instrument [syn: piano
       keyboard, fingerboard, clavier]
    3: a narrow strip of wood on the neck of some stringed
       instruments (violin or cello or guitar etc) where the strings
       are held against the wood with the fingers

Moby Thesaurus II by Grady Ward, 1.0:

51 Moby Thesaurus words for "fingerboard":
   A string, Amati, Cremona, D string, E string, G string, Strad,
   Stradivari, Stradivarius, bass, bass viol, bow, bridge,
   bull fiddle, cello, choir, claviature, console, contrabass, crowd,
   double bass, echo, eighty-eight, fiddle, fiddlebow, fiddlestick,
   great, ivories, keyboard, keys, kit, kit fiddle, kit violin,
   manual, organ manual, pedals, piano keys, scroll, solo, soundboard,
   string, swell, tenor violin, tuning peg, viola, violin, violinette,
   violoncello, violoncello piccolo, violone, violotta