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.
balladeer balladry balder blader bladder balloter billeter bladdery bolder bowlder boulder bleeder blatter builder bloodier bouldery belter bolter bleater bloater blotter blighter blottier
balladeer lader ladder lauder leader loader bladder blader coleader gladder gladier killdeer pleader reloader