Yes, chitin is a Scrabble word!
...and is worth 11 points in Scrabble, and 12 points in Words with Friends
chitin
Noun
1. A tough semitransparent horny substance; the principal component of the exoskeletons of arthropods and the cell walls of certain fungi
What Scrabble words can I make with the letters in chitin?
4 Letter Words
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3 Letter Words
2 Letter Words