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.
passus passes pases paseos paisas pusses pauses posses pisses peases pussies possess psis poussies poaceous paces psoas puses pisos pesos poses peises pizzas poises posies peaces piazzas piceous poesies
byssus passus missus jesses tosses massas guesses sues misuse missis quasses cusses issues casus basses messes loesses bassos gasses tasses lusus reissues gneisses chesses chassis cuisses wusses tussis mousses lassis susses nisus disuse asses suss posses wrasses sasses koussos lyssas josses chasses fosses lasses sous kisses tusses risus lassos fesses sisses cesses dosses disses fossas esses pusses hisses pisses misses cussos passes nesses musses mosses biasses busses cassis gausses chausses masses fusses kussos losses bosses tissues wisses yesses
passe passee pass pas pias spas pease pussy peas posse piss pase pays paseo paise paisa puss paws paps pause upas