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.
rabbity rabbit rabbet rabat rabid rabato rebait robot rebut rebid rebate rubied rubato rubati rubbed ribbed robbed rebody rebato reboot rubout rowboat
rabbity bitty babbitt hobbit rabbit dubiety ubiety bit