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.
cestoi cesti cesta xystoi cissoid cist cyst zest xysti zesty ceased cecity cessed siesta seaside society zooiest
cestoi xystoi stoa stoai stow beastie bestow gusto sati pastie pesto pistou postie cesti cissoid xysti gneissoid
cease cees cess aces ices ceases cesses chesses