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.
rubati rubato rabat rebait rabato rubout rebate rubied rebato rowboat rebid rabid rebut robot rabbet rabbit reboot rubbed rabbity rebought
rubati bat tubate debate rubato rebato rebate rebait rabato rabat niobate cubiti abate lobate boat beat batt bate bait rowboat baht sabbat towboat showboat
rub rubby rube ruby grub grubby krubi drub