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.
serious serous serais cerous serosa serows series sris sers serosae serries sears saros suers sorus seers saris ceros zeros sours seres xerus cerias sieurs cerise zeroes cereus cirrous sorrows sauries seeress souaris sierras sirs ceres sires soars suras sores cerci soras zoris cirrus source sirras sirees surras surahs sarees sirrahs sirrees soirees surreys
furious carious curious various serious triose torous ferreous serous curiosa cirrous aurous rearouse furioso parous carouse arouse brios hydrous arioso ariose trios vrouws ferrous curios roues cerous grouse barrios rouse ariosi crouse porous cheerios
serai serow seisor seizor ser sri