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.
fleshed flashed flushed fleeched fletched filched flitched flysheet flechette
fleshed flashed welshed slushed slashed leashed leched leeched lushed blushed lashed flushed fleeched clashed coalshed galoshed plashed polished relished sloshed toolshed woolshed
flesh fleshy flash flashy fleche flush