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.
prosos proses pyrosis process prosses prossies prises purses prases perses parses pursues presses praises parises paresis prisses pareses precess peruses prissies precious peeresses precis prezes prices prizes pierces precise piracies
ariosos prosos torsos xeroses soroses saroses resows proses rooses roses broses eroses pharoses virosis versos viroses carassows curassows gracioso grazioso neuroses neurosis pyrosis serosas sorosis xerosis trioses
pros prossie proso pross prose prosy presa uprose prase pursy proas purse prise prows parous prese pars parse perse press prissy priss purs praos pursue porous pyros porose uprouse