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.
posada posed pesade poised passade passado post hypoacid pasta pseud posit paced passed paused peaced peised peseta pissed posset postie piosity pst
posada sad tsade sade sadi said soda visaed cassata missaid misadd naysaid passade passado pesade resaid reseda tsadi
poesy pois poise poos pose posse posy poussie pows psoae psoai apos epos pops popsie popsy