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.
curst crest crust cursed crista corset crusty cruset curiosity coursed querist cristae cresset queerest creosote crosstie karst grist cariosity cuirassed cruised crusado creased crossed goriest crusade caressed caroused grisette crosshead
burst curst durst wurst hurst poorest jurist merest querist prost dearest rearrest purist frusta roust barest drest direst karst horst serest tryst aurist horste verste forest verset first fairest erst arrest crust worst sheerest tourist verist lyrist trusty truest verst queerest rust wrist frost corset grist crest rest crusty cruset worset airest trust aorist rusty nearest prest purest rarest searest sorest surest diarist dourest wrest sourest yarest
curs curse carse curios cures curacy cuirass cruse crus crosse cross cars crissa cressy curious crass course corse cors curassow curies curiosa curries cris cress currs scurries