Source : Webster's Revised Unabridged Dictionary (1913)

Whoremonger \Whore"mon`ger\, n.
   A whoremaster; a lecher; a man who frequents the society of
   whores.

Source : WordNet®

whoremonger
     n 1: a prostitute's customer [syn: {whoremaster}, {john}]
     2: a pimp who procures whores [syn: {whoremaster}]