The Answers for Wordscapes Level 52054 from the Light 30 pack and Master group are: rest, rue, ruse, rust, rut, set, strut, sue, sure, test, true, truest, trust, use, user, and utter.
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.