Yes, killer is a Scrabble word!
...and is worth 10 points in Scrabble, and 12 points in Words with Friends
killer
Noun
1. Someone who causes the death of a person or animal
2. The causal agent resulting in death
3. A difficulty that is hard to deal with
4. Predatory black-and-white toothed whale with large dorsal fin; common in cold seas
What Scrabble words can I make with the letters in killer?
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Words that can be created with an extra letter added to killer:
S:killers