Mugger

Noun

 * 1) A street robber.
 * 2) A person who makes exaggerated faces, as a performance; a gurner.
 * 3) A large crocodile Crocodilus palustris of southwest Asia, having a very broad wrinkled snout.

Thesaurus
assailant, assailer, assaulter, attacker, bank robber, beast, beldam, berserk, berserker, bomber, bookworm, bruiser, brute, bushranger, demon, devil, dragon, failing student, fiend, fire-eater, firebrand, footpad, fury, goon, gorilla, greasy grind, grind, gun, gunsel, hardnose, hatchet man, hell-raiser, hellcat, hellhound, hellion, highway robber, highwayman, hijacker, holdup man, holy terror, hood, hoodlum, hooligan, hothead, hotspur, incendiary, invader, killer, mad dog, madcap, monster, mug, muscle man, overachiever, plug-ugly, raider, rapist, revolutionary, road agent, robber, rodman, roughneck, sandbagger, savage, she-wolf, spitfire, stickup man, strong-arm man, swotter, termagant, terror, terrorist, tiger, tigress, torpedo, tough, tough guy, train robber, trigger man, ugly customer, underachiever, violent, virago, vixen, wild beast, witch, wolf