All I can say to you is "bow, bow, bow, bough, through, enough"! ;^D
You've sort of beaten me to pointing out one of my favourites with international friends learning English:
thorough
through
though
tough
ough
all with the vowel spelled the same, all (with the vowel sound) pronounced differently. And that's before you start *adding* letters back in.... like Lough.
tc
(To be fair, I find the difference between the 'ou' sound in thorough and the one in tough quite hard to distinguish but I think it's about tongue placement or something.)
(Can anyone tell I've got a video recording to make that I'm not wanting to do...?)