killer

Someone who kills. Usually this mean someone who kills other people, and does not have a good reason to kill.

Example: The police caught the killer today.

Something that kills.

Example: Lighting can be a real killer.

Something that cause problems.

Example: Failing the exam was a real killer.

Something that is very exciting.

Example: The show was great, a real killer.

If something is killer it kills.

Example: Watch out! There are killer bees!