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.
robalo roble rouble rebel rubel ruble rabble rebill reboil rubble rubbly rubella rubeola
robalo bal tibial sabal pibal cabal pueblo lowball qabala kabbala kabala cabbala cabala bubale labial baal bolo blow bawl ball bale bail bubal diabolo tubal