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.
dreads treads dorados drats druids droids treats derats trades triads teredos derates dirties derides tirades hydrids treaties hydrides hydrates diorites treatise druidess hydroids trets turds dirts darts deaerates tortas tortes traits droits tardies terrets toroids traduce triodes turrets
reads breads rereads treads dreads oreads parades lards brads bards protease credos triads redds reredos reds nerds readds breeds roads wards greats creeds teredos shreds shards charades uredos treats trades dorados grads nereids nards marrieds liards guards pards jereeds haeredes hoards broads rads bredes gradus boards grades herds jerreeds hards marauds sards greeds cards byroads heredes fards myriads braids redos frauds redes reeds parados proteas corrades raids tirades beards creds irades farads chards sherds yards
dread dared deaerate deaired derat derate dorado drat dreed dried dured tread treat treaty retard