The player may or may not be given a list of words to search for. Usuaully players are in fact given a list, but this is not absolutely necessary _ in fact the puzzle is much more difficult in the absence of such a list. Puzzle designers who choose not to provide a word list, do usually give at least a clue as to the type or subject of the words in the puzzle.
When you do decide to purchase a printable bridal shower game make sure to have the proper paper in your printer. A good cardstock will look more professional to your guests. Do be sure to pay extra attention to the printing instructions, some printable games will print on both sides of the paper and you don't want to waste a lot of paper trying get your print out right.