butchery vs slaughterhouse

butchery and slaughterhouse both are nouns.

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

As nouns, butchery and slaughterhouse are synonyms defined as:

Other synonyms of butchery include abattoir, shambles.

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