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.
bettas betas bets botas batts beads butts bitts beats beets botts biotas buttes betise beauts butties battues beds bads bits bats buts bots beauties baits bates bouts boats butes bides bahts bawds bodes boots bytes bauds bites bitsy beauteous buteos boites badass bedews bodies baddies bootees booties buddies bawdies bawties beedies biddies boodies
bettas lyttas pittas suttas cottas tas netts mottos tets ditas riatas bitts batts katas tots mutase pietas matts tads stays tuttis lattes teas tats shotts chotts cheetahs utas tuts tits dittos buttes dattos mattes satays rotas reatas putts fouettes ghettos stoas lotahs mottes fetas litas mitts iotas botts botas lotas taos jotas taws lottos quotas rottes betas etas zetas biotas setts fyttes motts mutts pottos raitas butts ottos getas tass taus pitas lottes watts chetahs shittahs yetts
betta bet butty butte butt bott bitty bitt beet beta beat batty battue battu batteau batt abet