abattoir vs slaughterhouse

abattoir and slaughterhouse both are nouns.

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

As nouns, abattoir and slaughterhouse are synonyms defined as:

Other synonyms of abattoir include butchery, shambles.

abattoir (noun)	slaughterhouse (noun)
a building where animals are butchered	a building where animals are butchered