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.
kussos koussos cussos cusses kisses gausses cuisses guesses quasses gussies quassias gasses guises kazoos cassis causes caseose cassias causeys
cussos bassos lassos kussos koussos sos passes tasses misos lyssas sisses resows pisses disses byssus gneisses massas masses missis cassis cesses lasses gneissose pusses susses chesses chassis wusses tussis tosses dosses wrasses missus sasses mosses posses pisos passus paseos musses pesos kisses cuisses biasses gasses gessoes loesses basses esses misses guesses jesses nesses losses josses sows asses messes mousses psoas bosses lassoes quasses fusses busses hisses soys sous fosses lassis fossas fesses gausses cusses tusses wisses chasses chausses yesses
kusso cuss cusso gussie gussy kiss kissy koss kousso kues