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.
cesti cestoi cesta cist cyst zest zesty xysti xystoi cecity cessed siesta ceased cissoid seaside society zooiest xyst
cesti feist resat postie resid neist pastie least wriest rest feast cuesta guest geste xystoi hygieist siesta zesty hest deist heist doughiest geest testa vest weest fiesta chest vesta shiest pesto fest sati xysti pesty reset reest resit nest pest lest cesta wrest cestoi gooiest quest hygeist zest beast jest zooiest beastie doest beset test gest testy best west east chesty besot yeast
cease cees cess aces ices ceases cesses chesses