asphyxiator
/æsˈfɪksiˌeɪtər/
noun
- A person or thing that asphyxiates someone or something.
- The faulty heater acted as an asphyxiator, filling the room with deadly gas.
- In the crime novel, the asphyxiator used a plastic bag to kill his victims.
- The chemical spill turned the factory into an asphyxiator for anyone nearby.