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.
pesto pest pesty pst pistou peseta past post psst posit piste pasty pasta paste peised pesade posset postie pseudo pastie passado piosity poussette
pesto stoa reest pesty reset least neist gusto wrest resod cesta jest gooiest gest xystoi hygeist cestoi zesty heist deist vesta doughiest hest testa fiesta weest fest chest vest shiest pest feist east siesta feast resat pistou resit lest nest quest wriest rest cesti cuesta guest geste zest stow hygieist zooiest beast doest beset test geest testy best west bestow chesty besot yeast
pes peas pease pees pehs peise peso pews pies poesy apes opes peps