The Collaborative International Dictionary of English v.0.48:

pepperwood \pepperwood\ n.
   A Pacific coast tree (Umbellularia californica) having
   aromatic foliage and small umbellate flowers followed by
   olivelike fruit; yields a hard tough wood.

   Syn: California laurel, California bay tree, Oregon myrtle,
        spice tree, sassafras laurel, California olive, mountain
        laurel, Umbellularia californica.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

pepperwood
    n 1: Pacific coast tree having aromatic foliage and small
         umbellate flowers followed by olivelike fruit; yields a
         hard tough wood [syn: California laurel, California bay
         tree, Oregon myrtle, pepperwood, spice tree,
         sassafras laurel, California olive, mountain laurel,
         Umbellularia californica]