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.
pitas pietas pittas pits pitsaw pities piteous pets puts pads pats pieties pots patsy potsy poets putts peats pates padis pouts patois pottos poetise putties patties poetess paydays paddies potties puttees paduasoy peds pods puds putz
litas raitas ditas pitas its tas bitts katas pittas codeias kits aits getas bites fetas mitts lyttas bitsy hits taus gites zetas kites bettas baits lotahs stoas riots mitis naiads dits shits chetahs wits whits waits toits titis tads doits medias mites writes biotas zits cottas iotas suits tass rites mutase reatas situs writs gits nites botas sits boites jotas satays teas suttas knits betas quiets gaits fits quits sites riatas coitus lits taws fiats pietas bits nits taos suites cites rotas redias quoits etas stays quotas lotas zitis pits dites diets ditsy duits tats tits utas whites wites cheetahs chits shittahs
pita pit pieta piety pitta pity opiate spit spite