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.
runs runes ruins rouens ruanas rins ruinous wrens rains rinse ranis roans reins ranees renews rawness rennase wryness rance
buns fauns funs huns guns muns nouns nuns puns runs suns duns tuns uns shuns