Think of the tools in a tool-box: there is a hammer, pliers, a saw, a screw-driver, a rule, a glue-pot, glue, nails, and screws. –The functions of words are as diverse as the functions of these objects. (And in both cases there are similarities.)
Of course, what confuses us is the uniform appearance of words when we hear them spoken or meet them in script and print For their application is not presented to us so clearly. Especially when we are doing philosophy!
— The Philosophical Investigations, Part I, section 11