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.
lumen limen lawmen laymen lomein lumina limn leman lemon liman lamina lawman layman lemony limina laminae
numen rumen lumen men laymen lomein amen lawmen ramen mien mean foemen cymene semen menu demean women yamen bemean meno limen cowmen cumin baymen noumena bowmen nomen hymen omen seamen vimen daimen human tamein showmen yeomen
lum lame slum plummy lime limey louma luma alme almeh alum blume flume glum glume plum plumb plume plumy slummy