The term 'COMPLETES THE PUZZLE' can be solved by the 6-letter word 'SOLVES'. This word is used to describe the action of finding the answer to a problem or puzzle. It is often used in the context of solving crossword puzzles, which require the solver to find the correct words that fit into the grid of empty spaces. The term 'COMPLETES THE PUZZLE' is a way of saying that the puzzle has been solved and all of the answers have been found.