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.
cirrus cirrous cirrose cires ceruse sirras cerous cereus sirrees sierras sirrahs sirs xerus ceros sires sorus ceres cerias cerise serous sieurs sirees surras zaires serious serries soirees sorrows surreys
cirrus cirrous parrs barres aureus myrrhs nairus murres torus serous ruse rues kurus cruse surras sirras derris torous purrs druse chirrs shirrs chorus durrs carrs tarres aurous grues arras churrs arris truss pareus whirrs porous charrs morros cerous ceruse burros xerus sierras sorus crus gurus burrs birrs praus torrs murras gnarrs murrs gharris errs parous terras dorrs cereus churros morris charros peruse urus orris trues varus virus chirres currs ferrous hydrous gyrus durras chirus sherris yirrs
cirri cire sirra sirrah sirree