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.
chassis chasses chausses chases chaises chaoses chesses chiauses choses cheeses chooses chouses chowses choices
cassis lassis chassis pussies quassias passes missis masses lasses isseis lassos hussies gussies passus gasses cassias sasses sissies tasses tussis chasses poussies wrasses lassies cissies oasis missies hissies phasis basis massas basses bassos biasses bossies sassies dassies tassies wussies asses quasses assais sis
chasse chais chaise chaos chase chaws chays chess chias