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.
horas horahs hoorahs hoorays horse hours hoars hoers horsy hoarse houris harass horsey hurrays hers hurrahs hears heres hairs heros hires heirs haars hares hearse hirees heroes heresy haeres harissa harries harrows hearsay heiress herries hurries
boras soras koras moras toras horas ors ras grass murras areas gyrase crass grays coirs bores oars kerrias boors bewrays raws norias pores frass soars rays cors pooris frays mores eyras varas muras boars rais ores hydrase horahs torus hoorahs mbiras harass horse liras prays fours yttrias dorrs tors torsi ureas whores doers worse dorsa durras choirs chores sharias drays shores terras yores trass douras hurrays forays braes prase morse toros boreas loris sours gorsy lours cooers eras hoers erase lores roars ours ferias horsy cores suras arrays nairas maras bras moors cerias morays praos duras serais torso proas pours sorus rase fores torahs hoorays hurrahs gerahs arias buras kors corse gores lauras varias arras hours hoars gorse giaours sores sirrahs goers jarrahs zoris noirs sierras cuirass rias terais tores praus brass phrase noris paras mors craws surahs brays sirras auras morass braws dors trays doors derays torrs torse urase whereas surras wooers draws tours charas choreas chorus dourahs shoers hydras tiaras yours
horah hora hoar hoary hoer hoorah hooray hour houri