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.
casein casini casino cassena cassene cassina cassine cassino cosign cosine cousin caisson cuisine quassin cozen
casein ossein sin sen mission hausen casini cuisine cosine cassino cassina sign lysin hosen seine fusain seen fission cassena lessen owsen peasen raisiny reseen resign resiny rosin rusine sasin seisin design sain sewn basin cassine cassene quassin cousin assign cosign zein lysine sine casino essoin sinh eosine hessian eosin loosen sene passion raisin reassign resewn resin risen rosiny cession scission session chosen
case casa cassia cause causey caws cays cosey cakes ocas