killer

Definitions

A person or thing that kills.

Something that is extremely impressive, effective, or difficult.

A person or thing that causes the end or failure of something.

Examples

The detective spent years trying to track down the serial killer.

That new song has a killer guitar solo that everyone is talking about.

Synonyms

murderer assassin slayer executioner homicide butcher hitman

Antonyms

savior protector preserver guardian benefactor lifesaver defender