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.
detour deter dieter touter deodar datura deodara dietary toter dater tutor tetra doter tetri doughtier dodder dotier teeter deader datary tidier tedder dotter tooter tetter totter deedier doddery dottier dowdier tottery tuatara daughter tattooer
tour faitour detour stour tor tory mature fetor motor auteur odour vetoer story foetor sautoir rotor hauteur viator stoure suitor datura tutor gator dour torr meteor tori store satori retore nature bettor quittor tore feature couture doura tora toro stoury suture future watthour
dato deet deity diet duet vetoed setout dieted dueted duetted