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.
proso pros pross prose pyros prosy praos prows proas parous porous pareos porose purs pars prossie pyres pears prise pares parse preys puris presa peers prays peris pores pairs paras purrs purse pries piers pours prees prese praus prase paris pursy priss perse parrs peres press pursue peruse prissy paries praise pareus hypers pooris purees pariahs parries peeress peeries perries prez
proso farrows brosy marrows rose torous parous gyros morros dross arose burros cirrous euros karoos porous arrows rosy arioso pharos proas froes cross furioso charros harrows curios churros cheeros troys trios toros hydros zeroes serosa cerous narrows trooz karroos roes taros serows rerose rows prose vireos pross heros prows grows eros faros erose frows gyrose ferrous praos furrows brios bros biros porose guiros cirrose vrows brows borrows zeros morose giros pareos torose barrios kouros brose tyros crows burrows barrows gross prosy heroes aurous verso pros broos pyros serous hydrous kaross chiros trois morrows ceros saros sorrows duros tiros torso trows cheerios yarrows