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.
caesar caesura caesurae quasar causer czar causerie gazar gazer gasser cusser kaiser cozier cosier gassier gauzier guesser queasier queazier
caesar sari sear soar hussar quasar maiasaur osar pessary rosary tsar tussar
casa case cassia cause causey caws cays cues gaes kaes cakes ocas