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.
gorsier grassier greasier grazier coarser crosier grouser corsair grosser greaser courser creasier grazer curser grocer cuirassier crazier crosser crozier crasser grocery creaser cruiser caresser carouser curiouser crozer coercer kreuzer
horsier pursier tarsier gorsier nurser grassier parser verser frowsier furzier prosier prizer coarser tressier raser bursera frizer cuirassier curser crosier courser pricer drossier ricer brassier corsair dorser peruser hoarser brassiere purser proser prissier eraser terser creasier greasier nursery riser rosier brasier pursuer dressier drowsier worser