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
killerA killer is a person who has killed someone, or who intends to kill someone.
• The police are searching for his killers.
Thesaurus for assassin from the Collins English Thesaurus
a murderer, esp one who kills a prominent political figure