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.
shellacks shellacs shlocks shylocks chalks
pollacks shellacks lacks clacks slacks blacks bollocks bullocks flacks killicks hillocks killocks lilacs mullocks placks pollocks rollicks shellacs lacs