aggressor

[ uh-gres-er ]
/ əˈgrɛs ər /

noun

a person, group, or nation that attacks first or initiates hostilities; an assailant or invader.

Origin of aggressor

1670–80; < Late Latin, Latin aggred- (stem of aggredī to attack; see aggress) + -tor -tor
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for aggressor