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.
clast closet classed coolest calceate closeout coaliest glost callosity closed calcite glassed gluiest callused coleseed gulosity calloused coalesced
last clast ballast blast whilst niellist duelist fellest volost delist cellist realist heliast molest chillest diallist pollist foulest blest coolest holist phallist illest dullest duellist fullest lust tallest glost dualist lost vilest sciolist relist realest dialist blasty chiliast list palest nailset halest alist violist least lest shoalest
class classy clause claws clays close colas cols glass glassie glassy