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.
heaviest heavyset highest huffiest
heaviest jiviest leaviest savviest waviest vest revuist goofiest revest leafiest daffiest fiesta lievest vesta buffiest divest chaffiest puffiest beefiest naivest iffiest reefiest huffiest devest miffiest suavest livest fauvist visit revisit vista rifest chuffiest