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.
guesses gausses guises cusses gasses quasses cuisses gases gooses causes kussos cussos kisses gauzes causeys gussies koussos gaseous quassias cases coses gazes cassis coseys casease caseose caseous cassias quizzes
esses fesses guesses chesses cesses yesses messes loesses jesses nesses eses kisses bosses quasses beses biasses kneesies ceases eases cheeses losses musses reassess gasses leses fusses dosses yeses cuisses cusses wisses tussehs teases dieses leases sisses seises wrasses basses lasses fosses mosses assess feases masses lessees asses busses misses pisses resees pusses peases isseis posses passes gneisses josses sasses chasses peises poesies possess mousses reuses sises susses disses tasses tosses tusses wusses hisses gausses chausses
guess gauss gussie gussy agues