garroter vs killer

garroter and killer both are nouns.

Word	Noun	Adjective	Verb	Adverb
garroter	Yes	No	No	No
killer	Yes	No	No	No

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

Other hypernyms of garroter include slayer.

garroter (noun)	killer (noun)
someone who kills by strangling	predatory black-and-white toothed whale with large dorsal fin; common in cold seas
	a difficulty that is hard to deal with
	someone who causes the death of a person or animal
	the causal agent resulting in death