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.
causer causerie cusser caesar cosier gasser kaiser gassier guesser caesura gauzier czar caesurae queasier gazer cozier kisser quasar goosier quizzer queazier
houser pauser douser user chouser mouser rouser muser causer ser mosser mossier lassoer rosery reissuer poser goosier raser nooser raiser gasser osier pisser issuer poiser guesser poseur geyser messier choosier rooser cheesier chaser wowser queasier tosser teaser hisser dosser diseur seiser sere saucer riser kaiser cosier newsier mousier hoser hawser looser pussier gassier kisser mussier easier tessera maser rosier laser hissier seer massier tusser sear dossier loser bossier baser hosier sera fusser masseur noisier sassier lesser misery nosier suer passer doser fussier busier cusser sissier leaser dowser miser wiser wussier chasseur chooser lousier
cause causey casa case cassia caws cays cues cuisse cuss cusso gauss auks ecus caucus ocas