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