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.
goofiest
buffiest chaffiest beefiest goofiest iffiest reefiest chuffiest puffiest miffiest daffiest leafiest huffiest fest fist deffest chuffest buffest fiesta divest deafest feist liefest foist jiviest leaviest feast heaviest safest rifest naivest waviest livest chiefest savviest