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.
deadest deediest detest dadaist didst dowdiest deduced dotiest tautest tidiest dottiest duettist tattiest doughtiest
deadest haddest giddiest hoodiest gaudiest headiest hadst headset reddest rudest rowdiest sadist podesta nudest featest neatest dowdiest moodiest wadset modest widest leadiest shadiest loudest fideist doest readiest maddest adust baddest latest beadiest faddiest bawdiest reediest saddest ruddiest deist seediest oddest deediest neediest tidiest muddiest weediest modesty woodiest lewdest shoddiest