The Answers for Wordscapes Level 64399 from the Vivid 38 pack and Master group are: aah, aha, ant, anthrax, art, hart, hat, ran, rant, rat, tan, tar, tax, taxa, and than.
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.