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.
sears sers seers saros suers seres saris soars serais sarees series serows sieurs serous sirs sris souaris serious sierras seeress serries sores sours suras soras sorus sires sirees surras sirras surahs serosa sauries serosae sirrahs sirrees soirees sorrows surreys
ears wears gears nears fears tears lears years sears rears bears hears pears dears shears ers ars jeers queers grease goers faros cooers fairs eros gars beers haars lairs heros pharos carrs vairs maars perse feuars paras boreas hairs areas cars hares ruers feres heres heirs peres charas keirs mares lares verse sers wares tares tars tiers urease souaris kiers charrs whereas cheeros choreas hers dares shiers doers tiaras seres airs xerus sieurs errs hearse varas saris saros paris arse greasy rares wooers ceres queuers creasy knars meres leers jars eras bureaus bares veers roars mars fares varus lars piers tarsi carse hoars pares maras ares quaeres peers wars gnarrs nares vars pairs naris lehrs crease biers boars fiars knaurs pars guars gaurs liars mairs coarse parse liers chairs bars gnars hoers cares hypers verso marse soars parrs viers laris ceros haeres hoarse peris wairs ureas wheres seers tahrs taros terse chares zeros weirs deers chars cheers shares suers sheers deairs shoers oars
sear ser tsar osar suer soar sierra serry sere serow serai sera seer saury sari saree user