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.
watts wats waits whats wheats wads wots wets wits whits woads whets wadis weets wades wites whites wadies waddies whidahs whiteys whities whydahs weds
batts matts watts hats cates vats dates bettas gates waits coatis beats bates cottas fatso bats neats haets oats ghauts gaits fyttes kats goats motts baits hiatus meats lyttas ratos mottes tats shotts doats shiatsu cheats dattos wheats boats tuts tits setts teats rottes putts mitts dawts lottes pates pittas gnats fiats patsy satis aits reatas bahts mats butts lats ghettos mutts fates eats fats katas heats ghats moats hates mattes chats qats pottos jatos gats fouettes lottos nates mauts mottos ates beauts vatus feats botts bitts shoats cats coats rats rates mates riatas buttes seats peats netts lattes pats dauts meatus tates chotts sates tauts tets suttas tots tuttis datos wats ottos dittos whats yetts
watt wat wait what witty swat twat