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.
buts butts bouts butes buttes beauts buteos bats bits buds bots bets butties betas boats bauds boots beats botts beauties bitts bahts baits bites batts bytes bitsy botas bates beets beauteous bettas boites biotas betise battues bootees bawties buddies booties bads bods beds bids bawds beads bides bidis bodes
beauts gouts shouts tuts tauts ruts puts outs nuts knouts muts mauts louts guts cuts bouts juts huts phuts ghauts buts pouts routs dauts touts uts shuts
but bute buteo butt butte butty