The best replacement for serial killers is mass murderers.

The best alternatives to serial killers are rated as following:

★★★★★	mass murderers
★★★	psychopaths
★★	computer programmers
★★	mass murders
★★	mass killers
★★	computer scientists
★★	murderers
★	female serial killers
★	white serial killers
★	men serial killers
★	nurture
★	spree killers
	scientists
	animal cruelty
	male serial killers
	computer geeks
	black serial killers

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Speaking about serial killers, one probably shouldn't forget about antisocial personality disorder.

Other search terms related to serial killers and their ratings are:

★★★★★	antisocial personality disorder
★	psychological problems
	psychological disorders

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Google Trends

Scale is based on the average worldwide traffic of serial killers in all years. Click on graph for more.

serial killers

mass murderers

psychopaths