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.
gladder gladier golder glider guilder gloater cloddier coleader colder clatter caldera glitter clowder colluder cloudier gleetier killdeer clattery glittery guiltier collider gauleiter colter kelter kilter clouter clutter coulter quilter
ladder bladder gladder reloader pleader lader lauder leader leadier loader alder balder blader cloddier coleader gladier balladeer plodder bladdery sledder