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.
rubious rubus rubies rubs rubbies rubes rebus rabies ribose rabbis rubasse rabbies rebs ribs robs ribes robes rebbes rebozo rebuys rubace
dubious rubious bios bouse bousy boubous gibbous niobous bis bos bus