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The Answers for Wordscapes Level 18596 from the Spire 9 pack and Master group are: act, attic, cast, cat, its, sac, sat, sit, stat, static, tacit, tact, tic, and tis.
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.