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.
blader bladder bladdery bolder balder balladeer bloater bleater blatter bowlder bleeder boulder builder bloodier bouldery balladry belter bolter blotter balloter billeter blighter blottier
lader coleader leader loader reloader pleader blader older gilder elater caldera slider cloddier bleater bowlder bloater golder louder lewder builder mouldier bolder elder balder glider bladder balladeer shoulder wilder wielder welder deluder solider lieder colder slater violater ladder alder moldier milder killdeer fielder lauder clowder eluder bladdery bleeder gladder melder relater aulder holder colluder leadier gelder balladry plater sledder boulder later collider floater flooder moulder bouldery polder solder gladier gloater guilder cloudier bloodier pleater molder plodder folder soldier zoolater dilater welldoer wieldier shielder yielder
blade balata bald baldy belady belaud blat blate bleat bled bloat bold ablate ablaut oblate