spree killer vs serial killer

spree killer and serial killer both are nouns.

Word	Noun	Adjective	Verb	Adverb
spree killer	Yes	No	No	No
serial killer	Yes	No	No	No

As nouns, serial killer is a hypernym of spree killer; that is, serial killer is a word with a broader meaning than spree killer:

spree killer: a serial killer whose murders occur within a brief period of time
serial killer: someone who murders more than three victims one at a time in a relatively short interval

Other hypernyms of spree killer include serial murderer.

spree killer (noun)	serial killer (noun)
a serial killer whose murders occur within a brief period of time	someone who murders more than three victims one at a time in a relatively short interval