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.
massas masas masses missays mesas masseuse messiahs misassay missus misses musses messes missis mosses missies mousses muses mises maces mazes misos mioses miosis misuse moseys mouses maizes meioses meiosis misease
fossas massas lyssas fesses assays visas resaws nesses lasses says lassos hisses casas masas psoas guesses cusses essays seas quasses koussos fosses nauseas missis gasses losses chesses chassis sisses wusses tussis wrasses tussahs tasses disses pisses passes sasses missays mosses cassis musses messes masses jesses sass asses saws mesas resays gneisses bosses dosses naysays seesaws chasses bioassays fusses esses mousses paisas lassis cussos posses passus cuisses misassay cassias tusses missus assais gausses basses biasses josses loesses misses quassias byssus chausses bassos kussos busses kisses pusses cesses susses tosses wisses yesses
mass massy massa masse mas missy amass missay mussy miss mossy mess moss moas messiah maes messy mosso mays muss maws amas masa omasa