Yes, slowly is a Scrabble word!
...and is worth 12 points in Scrabble, and 13 points in Words with Friends
slowly
Adverb
1. Without speed (`slow' is sometimes used informally for `slowly')
2. In music
What Scrabble words can I make with the letters in slowly?
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words