Yes, flump is a Scrabble word!
...and is worth 12 points in Scrabble, and 16 points in Words with Friends
flump
Verb
1. Fall heavily
2. Set (something or oneself) down with or as if with a noise
What Scrabble words can I make with the letters in flump?
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Words that can be created with an extra letter added to flump:
S:flumps