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.
pupae pupa pup pupu pipe pope poppa puppy pap pip pop pep papa peep pepo pipy poop
pupae jupe coupe cuppa loupe pupa rupee spae supe dupe taupe toupee chuppa