aggressor

As nouns the difference between attacker and aggressor

is that attacker is someone who attacks while aggressor is the person or country that first attacks or makes an aggression; that begins hostility or a quarrel; an assailant.

As nouns the difference between assaulter and aggressor

is that assaulter is one who commits assault while aggressor is the person or country that first attacks or makes an aggression; that begins hostility or a quarrel; an assailant.

Assailler is likely misspelled.

Assailler has no English definition.

As a noun aggressor is

the person or country that first attacks or makes an aggression; that begins hostility or a quarrel; an assailant.

As nouns the difference between taxonomy and aggressor

is that taxonomy is the science or the technique used to make a classification while aggressor is aggressor.

As nouns the difference between aggressor and nonaggressor

is that aggressor is the person or country that first attacks or makes an aggression; that begins hostility or a quarrel; an assailant while nonaggressor is one who is not an aggressor.

Aggressor is a synonym of victimizer.

As nouns the difference between aggressor and victimizer

is that aggressor is aggressor while victimizer is one who victimizes.