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.
casuals causals causeless gasless quezals quezales
visuals usuals casuals sals resales souls reassails sails sales salsa sauls seals sulus nasals masalas assails resails vassals reseals causals dossals missals sisals wassails
casual casually causal causally