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.
boresome berseem
boresome gruesome tiresome resume fearsome foursome grewsome presume trisome wearisome worrisome
bores bares boars boors boras boreas bourse braes brees brews bries byres