Yes, realm is a Scrabble word!
...and is worth 7 points in Scrabble, and 9 points in Words with Friends
realm
Noun
1. A domain in which something is dominant
2. The domain ruled by a king or queen
3. A knowledge domain that you are interested in or are communicating about
What Scrabble words can I make with the letters in realm?
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words