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.
pittas pitas pietas pits putts pitsaw pottos pities piteous potties putties pieties patties puttees pats puts pads pets pots peats patsy poets pouts pates padis potsy patois paddies paydays poetess poetise paduasoy
bettas lyttas pittas suttas cottas tas netts mottos tets ditas riatas bitts batts katas tots mutase pietas matts tads stays tuttis lattes teas tats shotts chotts cheetahs utas tuts tits dittos buttes dattos mattes satays rotas reatas putts fouettes ghettos stoas lotahs mottes fetas litas mitts iotas botts botas lotas taos jotas taws lottos quotas rottes betas etas zetas biotas setts fyttes motts mutts pottos raitas butts ottos getas tass taus pitas lottes watts chetahs shittahs yetts
pitta pit spit putto putti pattee pattie patty petti petto petty piety pieta pita pity potto potty putt puttee puttie putty spite