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.
fossas fosses fesses fusses fuses visas fasces feases fusees
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
foss fossa fossae fosse fess fesse foes foys fuss fussy