slaughterhouse vs abattoir

slaughterhouse and abattoir both are nouns.

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

As nouns, slaughterhouse and abattoir are synonyms defined as:

Other synonyms of slaughterhouse include butchery, shambles.

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