Yes, mucin is a Scrabble word!
...and is worth 9 points in Scrabble, and 13 points in Words with Friends
mucin
Noun
1. A nitrogenous substance found in mucous secretions; a lubricant that protects body surfaces
What Scrabble words can I make with the letters in mucin?
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words