Yes, krill is a Scrabble word!
...and is worth 9 points in Scrabble, and 11 points in Words with Friends
krill
Noun
1. Shrimp-like planktonic crustaceans; major source of food for e.g. baleen whales
What Scrabble words can I make with the letters in krill?
4 Letter Words
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3 Letter Words
2 Letter Words