Synonyms of 'assassin'
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hatchet man (informal)
You can refer to someone who makes changes in an organization by getting rid of lots of people as a hatchet man, especially if you think they do so in an unnecessarily harsh way.
a hatchet man for a famous gangland boss
Thesaurus for assassin from the Collins English Thesaurus
An assassin is a person who assassinates someone.