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.
triads trades treads triodes toroids tirades turds dreads traits tortas druids droids treats derides traduce hydrids dorados tardies territs teredos treaties druidess tortoise hydroids treatise hydrides tarts torts trets trots tarots tortes trouts dirties terrets turrets diorites tortuous
myriads triads cairds queridas corrades oroides aroids byroads redias bards hydrides beards marrieds farads borides girds grades irids viroids cards hayrides rids frauds rereads boards brides dorados yards hydroids shards choroids sciurids chards weirds bourrides ureides treads parados nereides droids toroids lards periods oreads roads liards gradus jerrids irades braids grids rides breads hybrids rads corridas cardias nards trades hards fards guards oreides giardias murids sards broads caritas veritas reads hydrids lairds raids hoards raitas parades jerids nereids readds grads tirades grides marauds dreads pards lariats irides druids derides birds joyrides wards charades brads chorioids shairds prides yairds yirds
triad treaty striate trad trade trait tread treat tirade triode tried trite ritard strait strata strati striata stride