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.
cross crosse cress gross crass crows curios crissa kaross cressy crouse caress curs carouse cors carious cuirass cris curious cars curiosa crus curassow carassow cores cries cruse croci curse coirs currs grass craws cures crews cares croze carrs grows carse corse kouros curies caries guiros creese grouse grassy course coarse crease cooers cruise karoos creasy carries corries cowries curries karroos gars kirs kors kris
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