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.
situs sits suits sites suites setous suds zits sots sets seats sides stews setts stays zitis stows stoss stoas satis suets cites sudds saids sates sties sudsy sadis soots suedes setose satays cities suttas sautes sayyids settees soddies suttees sods
situs coitus its knits taus bitts sits duits tuis medius battues diets vatus quiets litas aits bites hits fiats adieus ditsy zitis kites titis chits wites odious whites tutus riotous toits nites suites setous raitas pits dites rites baits writs mitis lotus quits boites bits hiatus foetus tedious etuis gaits whits suits fetus dits ditas kits gites bitsy zits pitas gits radius tuts meatus lits sites cites writes riots retuse quietus nits wits nidus mitts mites fits quoits doits tits waits shits