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.
ribby rubby rib ruby rabbi rebbe rebuy reb rob rub robe rube
ribby cobby shabby webby tabby sibb jibb nobby knobby lobby kibbi kibbe gabby cubby cabby baby abbey hubby hobby bubby bobby bibb knubby nubby rubby dobby tubby chubby yabby