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.
pippin papain pepino hypopnea
pippin pin lipin lippen lupin opine pepino keppen papain lapin rappen repin cioppino spine supine chopin shippen rapine kippen happen pein pain pion piny pine pina pian lupine apian rapini rappini repine spin spiny tiepin chopine shippon
pip pappi pappy peppy pipe pipy poppa poppy puppy