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.
ratos rats rotos rates reatas raitas radios riatas rads rets roadeos rots ruts riotous rods roads rodes rotas roots rotis reads raids rites rotes roods writs riots redos routs writes routes retuse redoes reties readds radius rottes redias rodeos readies roadies rowdies reds rids ritz
jatos datos ratos fados buteos feats beats hiatus mauts neats photos baits ghettoes reatas gnats teats chats matts wats dauts haets tates ghauts meatus dados ghats pottos cates taos fats gats shiatsu whats tots tattoos dittos bahts ketose stoss setous qats seats sates lotos riotous katas mottoes gaits coatis vatus beauts batts patsy bates kotows patois bats mates hats cats pates meats coats eats vats fatso kats ghettos ottos ates toes lottos mats rats peats goats mottos heats vetoes autos lats toss tows kotos matzo fiats toys moats fates pats aits gates ados oats satis hates stoas rates dates stows kowtows dattos boats doats dawts setose tats tauts nates tods waits riatas watts wheats rotos cheats shoats
rato rat drat prat raita rate ratty reata riata roto brat bratty frat irate crate grat grate orate prate urate