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.
idiom idem item
idiom dim dom podium tedium oidium sodom sodium radome radium medium odium bedim doum doom dome dime sodomy shahdom