Yes, invoker is a Scrabble word!
...and is worth 14 points in Scrabble, and 16 points in Words with Friends
Invoker is a valid Scrabble word.
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What Scrabble words can I make with the letters in invoker?
Words that can be created with an extra letter added to invoker:
There are 4 words that can be made by adding another letter to 'invoker'.