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.
cluttery clutter clattery clatter clouter glittery colter glitter coulter colluder cloudier kilter colder kelter caldera cloture gloater clowder culture quilter cloddier coleader collator collider gleetier guiltier gauleiter glider golder kultur
littery glittery cluttery fluttery flattery lottery clattery blatter blottier platter flitter plottier clutter slitter lotter slotter flutter letter blotter glitter latter litter plotter clatter reletter allotter slittier flatter sluttier