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.
grouser grosser carouser grocer curiouser gorsier grocery cruiser greaser crosser crosier courser greasier grassier grazer crozer curser grazier crasser kreuzer coarser crozier creaser caresser creasier crosshair cuirassier cursor coercer corsair crazier cursory
rouser trouser grouser curiouser arouser carouser courser trusser grosser hydrosere curser dorser cruiser purser crosser bruiser peruser rooser proser browser prosier rosier xerosere rosery drosera crosier nurser worser
grouse crouse gross grows grues gurus