I've taken a list of English words, and examined each of them to see what they sound like (using the PHP metaphone function). This page lists the most common metaphone codes, along with their words. You can also search for a word of your own, and see which words sound similar - and which ones rhyme, and which ones alliterate.
stoups stops setups situps stoops stopes stowps stupas stupes steps stapes steeps stipes steppes
stoups dopes stupes stowps stops stoops setups metopes dupes dups taupes topes topis dopas tops tups adipous autopsy biotopes getups cutups letups netops situps stopes topos stupas tittups
stoup setup situp stoop stop stope stowp stupa stupe estop