Synonyms of 'aggressor'
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Someone's assailant is a person who has physically attacked them.
Other party-goers rescued the man from his assailant.
You can refer to a person who attacks someone as their attacker.
There were signs that she had struggled with her attacker.
Thesaurus for aggressor from the Collins English Thesaurus
The aggressor in a fight or battle is the person, group, or country that starts it.