Yes, tinfoil is a Scrabble word!
...and is worth 10 points in Scrabble, and 12 points in Words with Friends
tinfoil
Noun
1. Foil made of tin or an alloy of tin and lead
What Scrabble words can I make with the letters in tinfoil?
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Words that can be created with an extra letter added to tinfoil:
S:tinfoils