Quote Originally Posted by NEO|Phyte View Post
How to get words: Find an unexplored barrow. Explore barrow. In the majority of cases, a word wall is in there. There are also some open-world word walls, generally guarded by a dragon.

Occasionally, if you've been Shouting a bunch in places (including undead-filled barrows, strangely), you'll get a note from a friend talking about how people are noticing your shouting, and directing you to a place where you can get a word.

You can also go talk to the greybeards to be directed to a word wall.
The barrows with unique names are your best bet, in my experience. Not places like "X's Tomb" or "Y's Barrow" but places like Volunruud (I think that was one of them).