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.
glost gulosity closet glossed gluiest closeout clast callosity closed glozed coolest glassed coaliest gallused glissade calloused
lost volost glost duelist dullest delist diallist holist niellist sciolist relist violist vilest chillest realest pollist fullest phallist molest illest foulest coolest clast teleost fellest halest alist blast list blest cellist realist poloist palest nailset ballast last lust closet lest soloist dialist dualist duellist tallest whilst shoalest
glossa gloss glossae glossy close gals glass glassie glassy glows gloze guls igloos