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.
soars souaris sours sears sorus soras sores saris saros sarees sorrows sauries sris sirs sers soirees sires seres seers suras suers series surras source serais serosa surahs sirees sirras serows serous sieurs seeress serious serosae serries sierras sirrahs sirrees surreys
boars soars hoars roars oars ors ars horsy boras varus boors hearse pharos lares marse coirs bores bears bares morse soras pears pars giaours horse corse tars moors coarse parrs fares fears noirs cors pairs gores pores tours sorus knaurs proas liars goers saris varas noris wares torse torso wooers chairs zoris chares tares chars doers chores shares dorsa shoers tears tiaras yores deairs wears gorsy parse ours mares torrs tores maars hairs maras vairs dorrs carse mars moras fores pours gnars jars airs bars ares knars nears lores ores loris mores gnarrs faros cars feuars gars torus rares horas gaurs lars sears taros fours laris fairs hours mairs ears lears gears mors cores hoers guars cooers nares hares pares naris pooris saros souaris cares lours haars sores arse toros toras kors rears hoarse doors vars lairs paris gorse koras paras carrs fiars hears wars wairs charrs tors torsi whores worse sours charas tahrs dears dares choirs chorus dors shears tarsi shores years yours
soar saree sari saury sear soiree sora sore sori sorrow sorry souari sour zoaria osar tsar