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.
pollack pollock plack pluck polka plucky plica pulik plague plaguy plaque plicae palooka pealike plaguey
pollack shellack lack slack shellac rollick alack black bullock flack hillock pollock killick killock kolacky lilac mullock plack clack lac