Synonyms of 'invader'
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The aggressor in a fight or battle is the person, group, or country that starts it.
They have been the aggressors in this conflict.
You can refer to a person who attacks someone as their attacker.
There were signs that she had struggled with her attacker.
Thesaurus for invader from the Collins English Thesaurus
Invaders are soldiers who are invading a country.