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.
trets treats turrets terrets torts trots tarts treaties treatise traits trades treads trouts tarots tortas tortes tardies triodes tirades territs teredos tortuous drats turds dirts darts dreads triads derats droits traduce derates dirties toroids derides diorites druidess hydrates hydrides tortoise deaerates
barrets trets rets carets frets garrets curets terrets berets burets ferrets turrets arts frats greats greets tarts courts karts brats curtsy borts artsy airts carrots treats hurts morts boarts drats parietes vertus gourdes aortas rats shreds shirts charts worrits warts tortes territs parrots derats sorts prats grots merdes trots crits farts cartes bruts keiretsu reds pierrots grits kurtas merits marts fortis parts cruets hordes korats brits hearts quartes ports virtus girts harts forts rots ruts bardes quartos fortes verts darts quirts aretes orts frits nerts jurats creds karats dirts carats carts tortas tarots torts writs certes quarts whorts worts cherts shorts yurts
tret torte stretto strette street retried retread retired reiterate trued trite tried treed treaty treat tread torta tared tort tired terete teredo tarty tart trot tyred retard retort retreat reuttered stretta stretti teetered