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.
gussies guesses gausses cusses guises gasses quasses cuisses quassias gases kisses cassis causes cosies cussos gooses kussos gauzes cassias koussos quizzes cases coses gazes cozies casease caseose causeys gaseous
bossies hussies lassies wussies gussies poussies pussies sassies missies cissies dassies sissies hissies tassies cassis biasses assais jesses basses losses posies fosses newsies lasses reissues musses assize hisses sisses assess esses messes pisses sizes busies chesses chassis kisses sises wisses tusses tosses susses missis dosses easies cusses sices fusses lessees issues loesses lassis gneisses masses gessoes cassias busses mosses passes guesses possess josses reassess quasses isseis daisies gausses posses quassias fesses sasses gasses wrasses nesses bosses mousses pusses kneesies misses asses cuisses lassoes wusses tasses cesses poesies cosies disses tissues tussehs tussis chasses chausses yesses sis