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.
cobia cob cobb cobby cabbie cowboy cab cub gob kob cube gobo goby kobo
phobia cobia obia oba obi boobie labia nubia soba dobie doobie tibia tibiae