bloodletting vs butchery

bloodletting and butchery both are nouns.

Word	Noun	Adjective	Verb	Adverb
bloodletting	Yes	No	No	No
butchery	Yes	No	No	No

As nouns, butchery is a hypernym of bloodletting; that is, butchery is a word with a broader meaning than bloodletting:

Other hypernyms of bloodletting include carnage, mass murder, massacre, slaughter.

bloodletting (noun)	butchery (noun)
formerly used as a treatment to reduce excess blood (one of the four humors of medieval medicine)	the business of a butcher
indiscriminate slaughter	the savage and excessive killing of many people
	a building where animals are butchered