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.
pietas pitas pittas pets pits pieties poets peats pitsaw petsai pities potties poetise putties piteous poetess patties paddies pots peds pads pats puts pedes pates padis patsy pouts potsy putts patois potsie pottos paydays poetize puttees paduasoy
betas etas zetas pietas fetas getas tas meets taos jotas beats beets beads meads foetus fetes katas mutase peats fetus taus cetes newts seats pets lyttas heads nets codeias netts kneads stoas yetis sheets cheetahs chateaus wheats weets tets tats duets diets deads suttas bets lotas setts heats neats riatas biotas fets tease eats reatas feats haets lets hets poets pittas metes satays ideas rotas litas leets metis pitas tass quietus keets gets iotas quiets raitas lotahs gateaus toeas botas taws vets suets reads teas cottas quotas rets bettas jetes sets meats jets leads stays deets ditas tads teats utas wets whets cheats chetahs shittahs yetts
piety pieta pet pit petty spit pied pipette peat peaty petti petto pita poet piped pipet pitta spied pity spite