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.
kaross karoos karroos gross cross crosse kouros caress kauris carouse kauries carious kirs kris kors cars gars carassow kiers crass gaurs koras kurus crows keirs grows guars carse grass cress cares carrs crouse coarse curios cressy grouse caries grassy guiros kersey crissa kyries carries cuirass curiosa curious kerrias kerries quaeres curassow quarries
cross pross dross gross kaross bros harrows pharos grows kouros heroes morose praos giros porous borrows karoos brass narrows biros brosy serous brios rosy cirrose euros arrows porose marrows guiros prose priss crosse ceros churros cheeros charros truss trows trios trass torose tiros hydrous duros drossy dress saros broos frass prosy barrios parous proso crass zeroes farrows burros gyrose crows serows caress brose heros karroos seeress sorrows grass zeros frows aurous morass pyros arose furrows morros brows harass heiress cerous vireos eros briss pros gyros barrows prows serosa ferrous curios rose morrows faros press cress pareos burrows peeress rerose froes erose cuirass vrows hydros rows toros taros roes torous tress cirrous trois troys duress tyros cheerios proas chiros yarrows