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.
semen seamen seaman semina someone soman cymene saimin simian simony simoon somoni summon symbion
semen foemen men daimen demon lawmen cowmen bemean omen noumena lumen leman yamen limen hemin reman haemin vimen foeman bowmen baymen women menu amen ramen numen nomen mean hymen gombeen laymen lemon rumen meno lomein seamen mien cymene daemon demean tamein showmen yeomen
seme same seam seamy seem semi smew some