butchery vs massacre

butchery and massacre both are nouns.

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

As nouns, butchery and massacre are synonyms defined as:

Other synonyms of butchery include carnage, mass murder, slaughter.

butchery (noun)	massacre (noun)
the business of a butcher	the savage and excessive killing of many people
the savage and excessive killing of many people
a building where animals are butchered

butchery (verb)	massacre (verb)
	kill a large number of people indiscriminately