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.
gradus grads grades grids grouts greats gratis gourds krauts grates guards grides greeds groats gourdes corrades cards grots cruds curds creds cords grits carats cairds creeds griots kurtas kraits crates crowds credos crudes karats cruets korats greets garrets caritas karates croutes creates garotes cardias carates grottos curates corodies corridas corrodes crowdies garottes garrotes grottoes keratose queridas
gradus rads readds frauds roads bards reads oreads perdues parados rereads liards sards myriads krauts dreads boards trades grades triads hoards charades cards shards raids beards radius sardius byroads fards breads braids broads nards pards parades perdus lards marauds brads guards dorados grads tirades corrades treads hards wards irades chards farads yards
grad grade garda gardai grat grate great grid gride groat grody