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i believe the term is called "homophone". however, being a native english speaker, i can certainly say that the words "fool" and "full" are pronounced differently. same goes with "sin" and "seen".

however, here's one: eight & ate. allowed & aloud.
those are just two examples. there are plenty more.

~mdog

Sole and soul. Poor, paw, pour and pore. Just to name a few...