Yes, ruler is a Scrabble word!
...and is worth 5 points in Scrabble, and 7 points in Words with Friends
ruler
Noun
1. A person who rules or commands
2. Measuring stick consisting of a strip of wood or metal or plastic with a straight edge that is used for drawing straight lines and measuring lengths
What Scrabble words can I make with the letters in ruler?
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words