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.
tweed tweedy tawed tewed towed tweet dawed dewed dowed twat twit
mayweed weeweed seaweed tweed weed wed shawed vowed cowed mewed hawed mowed jawed jewed dowed chewed sweet bowed sowed owed dewed tawed towed rowed chawed chowed shewed yawed powwowed showed lawed weedy hewed rewed tweet mawed bowwowed lowed meowed miaowed jowed tweedy pawed wowed weet viewed sewed swede dawed cawed gnawed sawed awed tewed yowed