Yes, harden is a Scrabble word!
...and is worth 10 points in Scrabble, and 10 points in Words with Friends
harden
Verb
1. Become hard or harder
2. Make hard or harder
3. Harden by reheating and cooling in oil
4. Make fit
5. Cause to accept or become hardened to; habituate
What Scrabble words can I make with the letters in harden?
6 Letter Words
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words