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.
hydros hydrous hydras hydrase tyros duros dross drowse drowsy drossy drys dors draws tiros trios dorsa dares trois tahrs doors troys dress druse dorrs dries durrs dures dears toros taros doers trows duras deers drays drees tyres dressy derris durras torose triose duress dories torous douras deairs dairies dearies derries diaries dowries durries yttrias
hydros erose morrows rose torous praos crows pareos duros arrows ferrous burrows kouros giros pros aurous rosy arose vrows proso frows gross kaross brows faros pharos troys churros charros trois toros vireos dross sorrows saros porose guiros barrios cheeros taros zeros cirrose rows prosy heroes pyros gyrose ceros morose serous eros heros karoos curios froes prose roes broos brose borrows proas karroos euros burros farrows brios drys narrows cross porous torose barrows morros brosy furrows serosa cheerios marrows rerose gyros prows harrows pross bros cerous zeroes hydrous biros trows grows parous cirrous serows dors hydras tiros trios tyros chiros yarrows
hydra hydrae hydria hydriae hydro