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.
quassins queasiness cassinas cassinos cassines gassiness caseins casinos cousins caissons cassenas cuisines cassenes cosines gossans cosiness gossoons quiescence
quassins sins caseins casinos cassinas cassinos cousins gossans caissons lessens cuisines lysines messans osseins raisins rosins sasins seisins fusains hessians essoins fissions eosins sains eosines basins sinus sinhs cosines cassines sines lessons lysins missions passions resins cessions scissions sessions