Yes, heighten is a Scrabble word!
...and is worth 15 points in Scrabble, and 15 points in Words with Friends
heighten
Verb
1. Become more extreme
2. Make more extreme; raise in quantity, degree, or intensity
3. Increase
4. Increase the height of
5. Make (one's senses) more acute
6. Make more intense, stronger, or more marked
What Scrabble words can I make with the letters in heighten?
6 Letter Words
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3 Letter Words
2 Letter Words