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.
sorus soras sours soars sores serous souaris sers serious sris sirs sorrows soirees suers sears suras saris zoris sires saros seres seers xerus surras sarees sieurs series serais source sirras serows cereus sirees cirrus cerous serosa ceruse surahs cirrous serosae serries sierras sirrahs sirrees surreys sauries seeress
sorus torus chorus ors coirs morse aureus giaours loris kurus boars gores crus rearouse virus boras soras aurous serious corse carious grues rues rouse pareus noirs arouse doers gorsy ceruse bores mores moors tors yores xerus shoers chores pours chirus wooers dorsa urus trues koras varus hoars oars tores torous ruse hydrous pores dorrs various serous torsi cirrus cereus gyrus cores horas curious ferrous hoers crouse cooers nairus praus gurus horse boors roues furious choirs parous porous goers lours hours vrouws noris fores horsy ferreous carouse grouse tours soars cors cruse truss moras ores cirrous roars ours sores cerous sours kors pooris dors whores worse fours peruse toras mors toros torrs zoris torse torso doors lores gorse shores druse yours
soar soiree sora sore sori sorrow sorry souari sour