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.
vapid
vapid rapid sapid tepid spied caped lipide lipid leaped gaped copied reaped cupid japed lipoid pied raped paid repaid heaped poppied soaped apod taped aped shaped