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The Answers for Wordscapes Level 18379 from the Bright 18 pack and Master group are: err, fee, ferries, fir, fire, free, freer, fries, reef, ref, refer, rife, rise, riser, see, seer, sir, and sire.
Just a heads-up: the puzzle layout on Master levels is autogenerated, so the grid you see here might look a little different than the one in your game.