"wo"
* woman
* wonder
* work
* word
* wolf
* worm
* worry
* would
* would've
"ough"
* ought
* though
* bough
"au"
* aught
* thaught
"o"
* own
* ow
* owned
"oe"
* oed
* oer
"ou"
* out (when the "o" is silent)
"u"
* use (when the "u" has a short vowel sound)
Please note that the "wo" sound can be tricky, and some words may be pronounced differently depending on the dialect or region.