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.
sequoias squaws sikas socas soaks segos skuas saigas segues sukkahs soukous segs sacs skis suks skas sags secs sics suqs skees sokes sicks sagos skies seeks scows sakis sakes sikes sagas socks sooks souks sucks skews sacks sykes sickos