1) Bruiser 2) Bully 3) Plug-ugly 4) Punk 
===Robber Fly=== Adult dragonfly, family Asilidae, shown with damselfly Ischnura verticalis, commonly called Eastern Forktail impaled on its proboscis. The fly is approximately 20mm long, and is in the process of sucking out the liquified innards of the damsel. Thanks for any feedback you can give. ...
Tough guy is slang for a particularly tough male.
[n] - someone who bullies weaker people
plug-ugly noun someone who bullies weaker people