Yes, grosser is a Scrabble word!
...and is worth 8 points in Scrabble, and 9 points in Words with Friends
grosser
Adjective
1. Before any deductions
2. Lacking fine distinctions or detail
3. Repellently fat
4. Visible to the naked eye (especially of rocks and anatomical features)
5. Without qualification; used informally as (often pejorative) intensifiers
6. Conspicuously and tastelessly indecent
7. Conspicuously and outrageously bad or reprehensible
What Scrabble words can I make with the letters in grosser?
6 Letter Words
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3 Letter Words
2 Letter Words