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.
bladdery bladder blader bouldery balladry bolder balder balladeer bowlder boulder blatter bleater bloater bleeder builder bloodier belter bolter blotter balloter billeter blighter blottier
bladdery ladder bladder bouldery cloddier gladder plodder sledder soldiery