On this page of our guide to TES V: Skyrim we have prepared a detailed walkthrough of (The Greybeards) Find the Word of Power side quest. We explain the basic principles of obtaining the information about the whereabouts of random Words of Power. You can repeat this quest many times and obtain various Words of Power as a result.
You can approach this quest only after finishing the main quest The Horn of Jurgen Windcaller. Enter High Hrothgar and find Arngeir. Tell the priest that you want to learn something more about the Voice and ask him of any new Words of Power (screen above). Arngeir will therefore send you to find a Word of Power to a randomly chosen location. You can repeat this quest multiple times. If Arngeir won't have any new locations for you, wait a couple days and speak to him again. In case you receive nothing again, it might mean that you have learned all the "widely available" Words of Power.