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.
poetess poets pots pets poetise potties poetize pieties pates peats potsy pouts pedes pities pietas pottos petsai piteous patties putties puttees pods puts pits peds pats patsy pitas poods putts patois pitsaw pittas potsie paddies
poetess fetes fouettes vetoes vitesse jetes gaieties metes moieties pieties reties cetes