Puzzles tagged with word-search should generally be about finding words within a grid, these types of puzzles are mass-producible so adding a twist or spin to them is a good idea.
Word searches are typically made up of a grid of letters (although one could be made with numbers) with words hidden vertically, horizontally or diagonally inside the grid that the solver must then find. In a standard word search the words that must be found are listed below (or near) the grid of letters. As word searches are generally simpler puzzles to solve and create, combining them with other puzzles or adding some kind of twist is encouraged.