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.
cupids coapts coopts capotes copouts cowpats keypads
lipids rapids cupids spuds bipods pipits kneepads mopeds lipoids lipides lapides bipeds keypads apods puds pods pits peds pads spits opioids updos
cupid capita copied couped cupped