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I think I just learned that some dialects/accents don't pronounce the w in water and the w in what the same way.

What's the difference?

What can be pronounced as "wot" or something like "hwot". I can't recall the technical term.

The «wh» in words like when, why, what can be pronounced as a voiceless labial–velar fricative (IPA sign: ʍ).