Yes, rennin is a Scrabble word!
...and is worth 6 points in Scrabble, and 9 points in Words with Friends
rennin
Noun
1. An enzyme that occurs in gastric juice; causes milk to coagulate
What Scrabble words can I make with the letters in rennin?
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Words that can be created with an extra letter added to rennin:
S:rennins