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.
grades grads grides grates gradus gourdes grids corrades crudes guards greeds greets gratis groats gourds crates greats creates karates curates garotes garrets carates corrodes garrotes corodies garottes crowdies grottoes curds cruds creds cords cards grits grots corrodies garrottes creeds grouts curets korats carets cruets krauts cairds kurtas carats crowds karats kraits cartes griots credos quartes croutes curites caritas cardias curtesy grottos corridas courtesy cowrites curettes keiretsu keratose queridas
irades tirades corrades trades grades charades parades roadies gradus merdes roadeos parodies fards borides redes ferrates curates hordes beards burdies crates brides grides berates bourrides breads hydrates lards sards readies tardies haeredes deaerates hardies rates crudes oroides shrewdies chards weirdoes wards urates triads gyrates seriates rereads pirates parados marauds laureates prides oreads nards nereides foredoes boards farads corodies brads karates bards corrodes phorates reads aerates prudes readds creates roads derates druidess dreads rodes perdues heredes irides crowdies hoards gourdes sarodes oreides corrodies redoes grates borates birdies hurdies variates cards fordoes hydrides joyrides narrates byroads rodeos carates derides rowdies erodes rads raids rides bredes orates hards frauds dorados braids bardes grads broads liards guards myriads pards prates cerates serrates muriates treads triodes ureides weirdies hayrides shards yards
grad grade garda gardai grat grate great grid gride groat grody