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.
stoped stooped stopped stiped steeped stepped stopt stupid seedpod
toped stoped stooped doped retaped tittupped tupped stopped dapped redipped topped stiped steeped retyped typed tapped taped dupped duped tipped dipped tittuped stepped chaetopod
stop stope step steppe stipe stoop stoup stowp stupa stupe estop