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.
fest feist feast feisty fiesta vest fist fast foist vesta fusty facet fessed feased facete vestee faucet fossette vast faced fazed fused fuzed ghast ghost vasty visit vista
best gooiest chest weest doughiest zooiest wriest vest hest geest gest jest fest quest guest lest nest pest reest rest wrest zest doest test west shiest