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.
greys grues gores grees grays greasy grease gars gurries crews gross gurus cries cares gorse gaurs grows cores grace guars cress goers gorsy graze cures grass grassy caress creese cressy grouse caries curies crease creasy quires guiros kersey kyries quaeres queries curries kauries kerries carries cowries corries quarries cars cors cris crus curs kirs kors kris
murreys treys preys surreys greys res curries hirees brays grays braes wries bourrees fries areas vireos jerries rees boreas forays veeries fores caries phoresy berries mares pyres harries peeries arrays gurries drys pares sores kauries paries heroes caress crews sirrees buries byres dearies sarees nereis quaeres frees cores tarries murres derries bewrays mores lures feres cries tares dories tress lores morays purees tyres wares whereas drays wherries tories whores worries rays cherries duress choreas shares shires series shrews trees peres dress mures dairies sirees hurrays gores prays haeres heres troys peeress fires rues tires hares reis varies corries aeries bries eyres curies gharries mires perries jersey lares zeroes seres frays kersey pores meres kyries soirees ores dares nares cires prese furies brews roes brees froes tores aureus drees pareos cereus ceres gyres hurries hires vires fares horsey cowries faeries ares barres aures eyries fairies lorries lories quarries grees hoorays cress zaires juries grues prees rares carries marries durries tarres seeress sauries presa pareus bares herries heiress trues dowries parries larees heresy cares cures moires ferries kerries lyres bores press sires ires trays quires murries trews dries derays tries queries diaries ureas wearies wheres serries pries whirries wires chares dures chirres terries chores sherries shores tres yores
grey gore gory gray gree grew grue agree ogre