Just wondering where I need to go to learn more words to a shout. I have two words for fire breath, 3 words to unrelenting force and want some words to my frost breath.

No spoilers, just simple answers like caves etc.

It varies, really. They're just about everywhere, except forts I believe.

I'm pretty sure you can ask the Greybeards for help on where walls are. Get to a point in the main quest and ask them.

I will just explore then I guess

Best way is to use your voice in crowds.....when audience is around.

Thanks Paajtor!

Didn't try that before, mainly because I was worried about killing a chicken or something.

You can find walls marked on your map as little dragon heads (assuming you show all that stuff on your compass. I don't. P:

If you're worried about that, use the Kyne's Peace shout

http://www.uesp.net/wiki/Skyrim:Kyne%27s_Peace

Shout around people and "A friend" will send you letters. (Various non-attack shouts work for this, such as Become Ethereal, Whirlwind Sprint, Slow Time, and Aura Whisper)
After retrieving the Horn, Arngeir will give you sidequests to find words.

All the dragon nests have them.
Most of the crypts (the dragon claw icons on the map) have them.

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Use the Spoilers Section if you have to post quest details or other spoilers or a thread about the same. I will move this now.

On word walls

Go on quests....and keep your headphones on and the volume up. More than once I heard the chanting before I saw the word wall!

R

There are 10 ancient walls marked with a dragon icon on the map

The rest of the walls are inside or near dungeons.

A few walls (3 or 4) can be accessed only via joining a certain guild because they're contained within dungeons not open to anyone. During my last play through, using a few console tricks to open doors I wasn't supposed to open, I successfully learned all 60 words of power. Most of them are worthless, though, or work only on enemies up to a certain level

On uesp.net