The Collaborative International Dictionary of English v.0.48:

Spicebush \Spice"bush`\, n. (Bot.)
   Spicewood.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Allspice \All"spice`\, n.
   The berry of the pimento (Eugenia pimenta), a tree of the
   West Indies; a spice of a mildly pungent taste, and agreeably
   aromatic; Jamaica pepper; pimento. It has been supposed to
   combine the flavor of cinnamon, nutmegs, and cloves; and
   hence the name. The name is also given to other aromatic
   shrubs; as, the Carolina allspice (Calycanthus floridus);
   wild allspice (Lindera benzoin), called also spicebush,
   spicewood, and feverbush.
   [1913 Webster]

WordNet (r) 3.0 (2006):

spicebush
    n 1: deciduous shrub of the eastern United States having highly
         aromatic leaves and bark and yellow flowers followed by
         scarlet or yellow berries [syn: spicebush, spice bush,
         American spicebush, Benjamin bush, Lindera benzoin,
         Benzoin odoriferum]
    2: straggling aromatic shrub of southwestern United States
       having fragrant brown flowers [syn: spicebush, California
       allspice, Calycanthus occidentalis]