Aggressor

n.

1.

The person who first attacks or makes an aggression; he who begins hostility or a quarrel; an assailant. The insolence of the aggressor is usually proportioned to the tameness of the sufferer. - Ames.

Noun	1.	aggressor - someone who attacks Synonyms: assailant, assaulter, attacker
	2.	aggressor - a confident assertive person who acts as instigator

AGGRESSOR, crim. law. He who begins, a quarrel or dispute, either by threatening or striking another. No man may strike another because he has threatened, or in consequence of the use of any words.

aggress, ambusher, assailant, assaulter, attack, attacker, avenger, beast, bludgeoner, brute, bully, harasser, harrier, hooligan, lapidator, marauder, night rider, nightrider, offender, piranha, predator, raper, rapist, retaliator, roughneck, rowdy, ruffian, savage, shedder, slasher, spiller, stabber, stoner, tough, vulture, wildcat, wolf, wrongdoer, yob, yobbo, yobo