Yes, diary is a Scrabble word!
...and is worth 9 points in Scrabble, and 8 points in Words with Friends
diary
Noun
1. A daily written record of (usually personal) experiences and observations
2. A personal journal (as a physical object)
What Scrabble words can I make with the letters in diary?
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words