butchery

butch|ery /b'ʊtʃəri/
1 [N-UNCOUNT]
You can refer to the cruel killing of a lot of people as butchery when you want to express your horror and disgust at this.
In her view, war is simply a legalised form of butchery.
2 [N-UNCOUNT]
Butchery is the work of cutting up meat and preparing it for sale.
...a carcass hung up for butchery.