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.
cession session scission sasin season seisin sozin seizin
fission cession mission session passion scission lesson ossein scion assign bassoon essoin cassina sasin caisson cassino gossoon quassin reassign hessian cassine sin son
cess cassias cassis messiahs cesses cissies chesses