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.
plodder polder pleader plotter plottier palter pelter plater poulter platier politer plaiter pleater platter polluter palliator pellitory paltry peltry poultry
plodder flooder sledder polder older louder bladder bladdery bloodier bolder ladder holder folder cloddier clowder colder gladder golder molder loader reloader solder