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.
road rad rod roadeo roadie rode rota raid read rood radii readd rowdy rodeo radio ready rat red rot rid rote riot roto rate rudd ride redo rued redd root reed roti rout rato rede rude riata wried rotte redia rooty reata rhyta reedy raita ruddy route ratty wrote
goad load road toad woad ad od