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.
frigged fragged frogged frugged frigate forked freaked frocked variegate forecaddie forgat forgot fracti foregut furcate virgate
frigged prigged rerigged trigged rigged frugged drugged dragged progged cragged bragged frogged fragged rugged raggedy ragged shrugged