Yes, dumper is a Scrabble word!
...and is worth 11 points in Scrabble, and 14 points in Words with Friends
dumper
Noun
1. Truck whose contents can be emptied without handling; the front end of the platform can be pneumatically raised so that the load is discharged by gravity
What Scrabble words can I make with the letters in dumper?
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words