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.
summery summer summary simmer smeary smear seemer seamer somber seamier simar samara sambar sambur sombre samurai semiraw
mummery summery shimmery jammer mammary summer smeary rummier rimmer hammer mimer gummier shimmer summary bummer emery emmer dammer timbery chummier yammer gemmier hammier rammer rammier mummer nummary cummer gammer gammier merry limmer gummer hemmer hummer jammier rummer ambery dimmer wommera shammer mammer simmer yummier