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.
riatas raitas reatas rats rotas riots writs ratos rates rites writes redias riotous rads ruts rets rots ritz rids ritzy roots rotis rides reads rotes rotos routs raids roads radius readds reties rottes routes radios retuse readies roadeos roadies rowdies
katas reatas riatas tas bettas mats lyttas lats haets fatso meats fetas coats ghats hiatus jotas pitas getas peats pats fates aits taos moats gaits gats baits matza betas oats ates raitas cats tads shittahs sates chetahs cheats ghauts wheats watts zetas waits teats seats tats vats qats dauts ditas teas dates lotahs stoas gnats ratos boats taus nates rotas eats tass hats kats pates quotas mauts matts bahts etas beauts cates batts litas jatos pietas bats hates biotas vatus mutase fats botas meatus coatis heats patsy lotas pittas goats feats bates rates gates satays neats fiats cottas rats nadas suttas taws datos mates doats dawts iotas tates tauts stays utas wats dadas whats chats beats cheetahs shiatsu satis shoats
riata rat trite drat prat gritty grate crit irate frit raita rate rato ratty reata riot rite writ write brat bratty brit britt frat fritt crate grat grit orate prate triad urate