Perfect Matches:
* house
* mouse
* out
* about
* proud
* how
* now
* cow
* vow
* bow (as in bow and arrow)
* frown
* town
* gown
Close Matches (with slight variations):
* cloud (slightly more "oo" sound)
* loud (slightly more "oo" sound)
* should (slightly more "oo" sound)
* crowd (slightly more "oo" sound)
Remember, the exact vowel sound in words can vary slightly depending on the speaker and their accent.