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.
feats fats fets fetus fiats fetas fatso fates fetes foetus fatties fads vets feds fits fatuous vats fouettes feeds fades feuds feods ghats vatus fados foots footsy vetoes ghauts fyttes foodies fuddies ghettos footies footsie ghettoes fids fuds futz
beats eats feats teats peats wheats neats meats heats seats cheats vets hets lats bahts getas batts meets toeas etas qats quietus lets fats metis rets ghauts gats ratos hiatus sets haets cetes beauts fetes nates beets foetus gnats quiets pates fatso deads yetis shiatsu beads chateaus betas wets watts waits gaits poets tats duets diets dauts ghats dates jetes suets nets baits reads ideas patsy pets kats gets coatis codeias leets heads meatus tease keets meads cats rates fiats vatus matts bates newts fetas mauts katas weets moats aits kneads gates hats gateaus leads vats whats fets ates cates mates coats mats tauts metes satis jatos rats tates pietas oats bets boats pats hates fetus teas reatas bats goats sates jets fates netts setts zetas datos dawts deets doats tets wats riatas whets chats sheets shoats yetts
feat fat fet fate fatty feet feta fete fiat