Yes, fussiest is a Scrabble word!
...and is worth 11 points in Scrabble, and 12 points in Words with Friends
fussiest
Adjective
1. Annoyed and irritable
2. Overcrowded or cluttered with detail
3. Exacting especially about details
What Scrabble words can I make with the letters in fussiest?
7 Letter Words
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3 Letter Words
2 Letter Words