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.
besot best beast beset bestow bast beastie bust boast boost busty basset beside bassett
besot sot east best beset beast soot geest feast geste hygieist cuesta guest least nest missout reest reset resod wrest cesta siesta zesty deist doughiest testa weest chest shiest pesto feist fest pesty phaseout vest vesta heist hest gest fiesta hygeist jest gooiest quest lest pest neist resat resit rest wriest cesti zest zooiest doest test testy west chesty yeast