The Collaborative International Dictionary of English v.0.48:
Raver \Rav"er\ (r[=a]v"[~e]r), n. One who raves. [1913 Webster]WordNet (r) 3.0 (2006):
raver n 1: a participant in a rave dancing party 2: someone who rants and raves; speaks in a violent or loud manner [syn: ranter, raver]