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A killer is a person or thing that kills, meaning they end lives. Killer is also used in slang to mean something that is devastating or exhausting. Additionally, killer is used in slang to describe something as severe or powerful. Killer has several other meanings as a noun and an adjective.

A person or thing that ends someone’s life is a killer. In terms of a person, killer is often used interchangeably with murderer. However, killer can refer to someone who killed another person by accident, while murderer is not used in that sense.

• Real-life examples: John Wilkes Booth was Abraham Lincoln’s killer. Jack the Ripper was an infamous killer. Bacteria and viruses often act as natural killers. People use weed killers on their lawns.
• Used in a sentence: My cat is a very effective killer of birds.

In slang, killer is used to describe something as causing stress, exhaustion, pain, or misery.

• Real-life examples: You might call a particularly hard test a killer test. A killer workout would push your body to the limits of its abilities.
• Used in a sentence: That history assignment turned out to be a killer and took me forever to finish.

In slang, killer is also used to describe something as severe, intense, or powerful.

• Real-world examples: You might call a baseball game that goes into extra innings with a 2–2 score, a killer game. If you come down with a severe cold that keeps you in bed for several days, you could call it a killer cold.
• Used in a sentence: After living abroad for five years, Michelle came down with a killer case of homesickness.

The first records of the noun killer come from around 1525. It is formed from the verb kill, meaning “to end a life,” and the suffix –er, which indicates a person that does the action the verb describes.

What are some other forms related to killer?

• self-killer (noun)

What are some synonyms for killer?

• murderer
• assassin
• slayer
• devastating
• exhausting
• severe
• powerful

What are some words that share a root or word element with killer?��

• kill
• killer bee
• killer app
• killer whale
• serial killer

What are some words that often get used in discussing killer?

• murder
• manslaughter
• homicide
• hired
• unknown
• silent

Killer is a common word that refers to people or things that end lives. It is also used in several slang senses.

The family of Helen McCourt have told Sky News they are pursuing a judicial review in relation to the decision to release her killer Ian Simms from prison

— Sky News Breaking (@SkyNewsBreak)

Working on names for this weekend's killer snowstorm: Snowmagilla. Snowgantua. Snowmongous. Snow's Your Old Man. The Great A-Flakening…

— John Kelly (@JohnKelly)

I'm experiencing a Web Developer rite of passage:

I have a killer idea for a CMS 😆

— Hashim Warren 🌄 (@hashim_warren)

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Is killer used correctly in the following sentence?

The detectives determined that the killer used a baseball bat as a weapon in every murder.