Yes, mostly is a Scrabble word!
...and is worth 11 points in Scrabble, and 12 points in Words with Friends
mostly
Adverb
1. In large part; mainly or chiefly
2. Usually; as a rule
What Scrabble words can I make with the letters in mostly?
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words