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.
rebuys rebus rebs rubus rebbes rubious rubs robs ribs ribes robes rubes rabbis rabies rebozo rubies rabbies rubbies
buys rebuys bus bys abys doughboys phoebus rubus abuse rebus boubous obeys babus lowboys abyss gibbous buoys bubs buss boys beys bays bubus habus cowboys niobous busy poboys zebus abbeys tabus