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.
feast fest fast feist feased feisty fiesta vest fist vast facet vesta ghast foist fusty vasty facete faucet feazed fessed vestee fossette phaseout
east beast feast least yeast mayst boast best zesty resat roseate baste bast reset test nest seat caste toasty nauseate pest doest haste pesty cesti chesty geest geste caseate misseat wast testy taste deist siesta wriest gest vasty chaste maist hygieist rest besot paste beset vesta cuesta gooiest quest weest sayst past neist reest fast doughiest pasta hast waist roast miseat cast oast mast jest guest wrest pesto vest feist last lest resit testa west ghast nasty fest hasty fiesta hest vast pasty hygeist zooiest coast chest gast heist reseat cesta zest disseat tasty toast waste shiest yeasty
fease fas fes fays feaze fees fehs fess fesse feus foes