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.
dauby daub daube dab dub doby doughboy dobby tubby tabby deb dib tab tub tabu toby tuba tube
dauby aby shabby tubby baby bubby hubby cabby cubby gabby gaby knubby nubby rubby ruby daub daube tabby chubby yabby