According to the pronunciation symbols used on www.m-w.com, the various pronunciations of ough (including some rarer ones) would be written:
- of - cough
- ü - through
- au - bough
- &f - enough
- O - though
- o - thought
- & - Flamborough
- &p - hiccough
- äk or äk - lough
- äf - Gough
- ä - nought, ought
Note: for many people, ä is pronounced the same as o, so the last two probably shouldn't be counted as separate sounds.