Don't know about Nook, but word searches are easy on a Kindle. From just store testing, to me the Kindle navigation is also easier, it turns pages faster and the screen is brighter.
I hope the Kindle does NOT eventually migrate to touch screen. I'm always having to wipe fingerprints from my iPhone and new iPad to read more clearly. Not having fingerprints all over it keeps the Kindle's screen always crisp and sharp for reading. Just my preference. Of course others might not agree.
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