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.
beets bets beats betas bettas bedews beauts beedies bots buts bootees bits bats beds beauties bouts bitsy boots baits bites butts boats beads butes botts bates bahts bides bytes botas bitts bodes batts beauteous buteos boites buttes biotas betise bodies biddies bawties booties boodies buddies battues bawdies butties baddies bads bids bods buds
beets sheets weets leets keets deets meets pets needs wheats netts bootees cheats redes seeds goatees lets rets fetus diets etas tees suets meats tutees feeds yetis aedes suttees jets gets hets fetes fets metis fetas quiets feats deeds teats cetes vets haets poets settees pedes cedes sets heats reeds nets pietas bets jetes zetas suedes newts foetus neats coatees puttees peats quietus seats meeds betas getas heeds eats setts beats dees duets tets weeds wets whets metes yetts
beet bet beat bedew beedi beta betta abet