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.
gator gater gaiter cater gaydar quatre goitre goiter guitar coater cuatro gutter gadder catarrh cattery cattier cautery gaudery gaudier goutier guttery guttier quittor
viator gator tor tutor stour dater sautoir store retore satori vetoer quatre pater neater tatar chador meteor tori later cuatro toro torr gater coater heater tora tore bettor tory eater foetor cater feater hater oater motor mater quittor tour beater faitour boater fetor rater rotor satyr seater story suitor detour tater water cheater
gat gait gate gateau goat goatee agate