People who enjoy killing are most likely psychopaths but other then that there are no speical words for someone who likes to kill...well I guess you call just call him a ruthless cruel person with no regards of human life a or maybe Misanthropy (a person who hates humans)
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A person who enjoys killing is commonly referred to as a "murderer" or a "serial killer." These individuals have a deep-seated psychological issue and often lack empathy towards their victims.