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.
geyser geezer
geyser ser sera cusser pussier gassier issuer guesser passer kisser looser raser laser seer hosier pisser baser houser riser lousier suer causer sere masseur noisier rouser choosier cheesier misery chaser wowser diseur user tosser douser mousier teaser mossier dosser poser seiser mussier nosier messier rosery leaser sear hoser lesser cosier busier maser rooser bossier hissier poiser hawser fussier reissuer lassoer loser queasier pauser kaiser hisser goosier raiser gasser fusser easier massier nooser muser rosier miser osier newsier sissier poseur dossier mouser tessera dowser sassier tusser wiser doser wussier chasseur mosser chooser chouser