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.
rune run ruin ranee renew rouen ruana runny ran rin rain rani rein roan wren rainy reign
kune lune rune dune tune ne un