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.
courser curser coarser carouser cursor curiouser cruiser crosser gorsier grouser corsair creaser crasser crosier cursory cuirassier caresser creasier crozer greaser coercer crazier grosser crozier grassier greasier grazer grocer grazier grocery kreuzer
courser nurser curser purser trusser terser hoarser dorser curiouser carouser arouser gorsier proser parser raser cruiser coarser horsier pursier verser pursuer grouser bursar eraser nursery bruiser bursera peruser cursor rouser tarsier riser trouser worser
course cors curs coarse coirs cores corse crouse curassow cures currs curse scours