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.
pleader pleater plater polder plaiter platier platter plodder palter pelter plotter politer poulter plottier polluter palliator paltry peltry poultry
leader pleader coleader shielder welder reloader bladder leadier lewder lieder ladder loader lader gladier alder blader lauder balladeer fielder gladder melder bleater balder pleater bleeder sledder elder wielder gelder yielder
plead pled paleate paled pileate piled plaid playday pleat pleiad plied poled puled