Many of my students are surprised to find out that the following three words are all pronounced the same:
they're, there, their
Here are some more homophones which might surprise you. If you have been pronouncing these words differently, it's an understandable error. English spelling is crazy!
Same pronunciation:
berry - bury
atom - Adam
do - due (in British English they're different)
billed - build
so - sew
son - sun
metal - medal
wore - war
won - one (this one always surprises people)
Which ones surprised you?
(You can find a list of other homophones in my book, "Mastering the American Accent")