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.
bowlder bolder boulder bouldery bolter balder blader builder bleeder bladder bladdery bloodier balladeer belter bloater blatter bleater blotter balladry balloter billeter blighter blottier
bowlder lader colder lewder alder gelder balder blader aulder mouldier solder moldier polder solider milder welder killdeer wielder golder wilder colluder shoulder caldera bolder boulder molder clowder folder fielder holder elder builder eluder moulder slider older bouldery soldier melder deluder guilder welldoer glider wieldier collider shielder gilder yielder