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.
grocery grocer grouser grosser grazer crozer cursory gorsier crosier coercer grazier crosser greaser crozier carouser greasier grassier curiouser cursor curser coarser courser crasser crazier creaser cruiser kreuzer
grocery rosery forcer grocer mercery sorcery tracery