The Collaborative International Dictionary of English v.0.48:
Bawler \Bawl"er\, n. One who bawls. [1913 Webster]WordNet (r) 3.0 (2006):
bawler n 1: someone who communicates vocally in a very loud voice [syn: roarer, bawler, bellower, screamer, screecher, shouter, yeller] 2: a loud weeper; "their new baby is a real bawler"