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.
doughtier daughter dotier dottier doter touter dotter dowdier toter dater titer deter totter tooter tidier dodder titter detour tauter dieter deedier dietary doddery tattier tottery tuatera tater tetra titre
haughtier doughtier doughier daughter whitier tier