butchery vs carnage

butchery and carnage both are nouns.

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

As nouns, butchery and carnage are synonyms defined as:

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

butchery (noun)	carnage (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