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.
skas skuas sikas skis suks sacs sags sukkahs skees sagos sucks seeks skews sykes skies sicks sakis sagas sakes sokes sacks soaks sikes socas sooks souks socks squaws saigas sickos sax soukous sickees sickies zaikais secs segs sequoias sics suqs cycas scows segos
kas hookas kakas quokkas okas pikas sikas skas takas tikkas wekas chukkas