Yes, coign is a Scrabble word!
...and is worth 8 points in Scrabble, and 11 points in Words with Friends
coign
Noun
1. Expandable metal or wooden wedge used by printers to lock up a form within a chase
2. The keystone of an arch
What Scrabble words can I make with the letters in coign?
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words