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.
blocker blockier blacker balker bilker balkier bleaker blogger bulkier baulkier beliquor beleaguer bulgur
blocker clocker locker flockier slicker flickery pluckier flicker colickier clicker clacker blockier flackery blacker luckier looker licker lacker plucker slacker shlockier