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.
butts buttes buts butties bouts bitts batts butes botts bettas buteos beauts bits bets bats bots battues buds beauties baits boots bates beets bahts boats bauds botas bites bytes betas beats bitsy beauteous boites biotas betise buddies bawties bootees booties bads beds bids bods
butts mutts putts uts louts matts huts botts routes cutes cuts bouts bitts mottos rottes suets lottes suttas mutes duets puts beauts sautes pottos batts buts shuts tutus shouts chutes tots watts tets utes butes tats outs tuts mitts bettas autos routs nutsy netts dauts quits fouettes phuts ghettos cottas lottos mauts ruts tuttis lyttas knouts tauts setts dittos dattos mattes utas tits gutsy suits ghauts fyttes muts lutes pouts pittas ottos guts duits touts nuts mottes lattes cutis buttes gouts juts chotts motts shotts shutes jutes yetts
butte butty butt but bitty buteo bute bout bott batty bitt betta battue battu batteau batt abut