The Answers for Wordscapes Level 13857 from the Crest 7 pack and Master group are: gin, gnu, gun, gut, guy, inn, nun, nut, tinny, tug, tuning, tying, unit, unity, and untying.
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.