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.
tetra tetri tetter teeter tuatera tuatara toter dater titer tutor deter tatar titre doter tater datura tooter touter tedder tauter totter dotter titter detour dotier tidier tatter dieter deodara dietary dottier tattier tottery daughter tattooer doughtier
tetra terai satara retry poetry metre nutria terra tora tray meeter yttria atria teeter deter tetri sutra tuatera stray deray fetor hetaerae hysteria retro peter meter metro latria quieter madeira foetor hetaera hatteria dieter datura betray stria tuatara straw sheeter