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.
guardian gardenia garden gradin quartan gradine guerdon gueridon gratin cardon cardoon gratine carotin curtain carrotin gratinee carton cordon cortin cretin
guardian gradin sourdine sordini sardine reordain pardine ordain nardine meridian lurdane lurdan jordan radian hordein hirudin harridan viridian verdin redan puritan sardana sordine sordino turdine
guard garda gardai gourd gourde