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.
gaieties gates gaits gaudies kitties catties gats goatees goats cates kites gadis quiets coatis guides gaddis cuties coatees goodies cutties quietus gateaus caddies cooties kiddies kats qats guts cats gads kits kadis keets cutis katas guids gudes cades cotes cutes goads cadis gutsy kytes gauds qaids caids gouts coats quits qadis caddis coitus cutesy ketose quoits quotes
gaieties pieties reties moieties ties poetise pities catties butties metes patties etuis beauties cutties fatties beedies jetties potties booties cities dauties deities duties tides tutties chitties betise laities metis bawties poetize putties fetes fouettes vetoes jetes poetess cooties footies hotties kitties jutties cuties cetes sties dawties ditties tatties titties whities yetis tis