Yes, toxin is a Scrabble word!
...and is worth 12 points in Scrabble, and 13 points in Words with Friends
toxin
Noun
1. A poisonous substance produced during the metabolism and growth of certain microorganisms and some higher plant and animal species
What Scrabble words can I make with the letters in toxin?
4 Letter Words
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3 Letter Words
2 Letter Words