When you search for word walls, do you need to learn the words in order? Or do they really not have a set order and they just go in whichever order you find them? If they don't do that what happens when you find the 3rd word to a shout 1st?

Certain word walls could actually be more than 1 possible word depending on other words that you've found already. If that makes sense, lol :/

Basically the game won't allow what you described to happen, as far as I know.

The words do not need to be learned in order.

I think each word wall has a predefined Shout, and the particular word on it is the lowest-level one you haven't already discovered.

Speaking of word-walls... what's up with only learning one of the hundreds of words on there??
If I were the Dovahkiin I would just sit and stare at the wall for hours and learn all that [censored]!