Wordnet 3.0
NOUN (1)
1. 
 a person who vomits; 
[syn: vomiter, spewer]
The Collaborative International Dictionary of English v.0.48:
Spewer \Spew"er\, n.
   One who spews.
   [1913 Webster]
WordNet (r) 3.0 (2006):
spewer
    n 1: a person who vomits [syn: vomiter, spewer]