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.
seamen semen seaman saimin someone soman cymene semina simian simony simoon somoni summon symbion
amen ramen yamen seamen men showmen women diamin damn daimen baymen nomen lomein cowmen bemean mean meno menu mien amin yamun lawmen omen hymen limen noumena foemen numen rumen vimen seaman gamin semen bowmen cymene daman demean tamein shaman lumen laymen yeomen
seam seamy samba sambo same seem seme semi sesame