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.
pest pesty pesto pst peseta psst past post posit pasta paste pasty piste postie posset pistou pastie pesade peised piosity poussette paced posed pseud
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