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.
lipin lapin lupin lippen lupine loupen
lipin pin chopin taipan spiny spin ripen repin rapini pippin papain opine lupine lupin lapin gipon pion apian piny pine pina pian pein pain pepino rapine rappini repine cioppino spine supine tiepin chopine
lip lipa lipe lippy blip flip flippy clip slip slipe slippy