Yes, devised is a Scrabble word!
...and is worth 12 points in Scrabble, and 13 points in Words with Friends
devised
Verb
1. Come up with (an idea, plan, explanation, theory, or principle) after a mental effort
2. Arrange by systematic planning and united effort
3. Give by will, especially real property
What Scrabble words can I make with the letters in devised?
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Words that can be created with an extra letter added to devised:
T:divested