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.
cobby cobb cabby cubby cob cowboy goby gabby cobia cabbie cab cub gob kob cube gaby gobo kobo
bobby knobby nobby cobby lobby hobby dobby cobb goby cabby ribby nubby gabby looby tabby webby knubby yabby cubby shabby abbey chubby bubby rubby tubby baby booby poboy hubby toby obey doby yobbo