slash·er 
/ˈslæʃɚ/ noun
plural slash·ers /ˈslæʃɚ/ noun [count] : someone who kills people with a knife or other sharp weapon
▪ a slasher movie/film [=a movie in which many people are violently murdered by a slasher]
▪ a slasher movie/film [=a movie in which many people are violently murdered by a slasher]
