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.
garotter garroter grottier garter grouter gritter groutier grittier carter grater carrotier critter greater grodier quarter guarder greeter quartier grader carder crater krater curter gridder crowder crittur courter courtier cowriter criteria greedier corder cruder
rotter trotter garotter charioteer parroter brattier sorter porter grouter grittier garroter carrotier frotteur fritter frettier fretter router prettier ruttier rooter ritter rioter reutter rattier critter ratter gritter rootier grottier shorter
garote garotte grot garrote garrotte griot groat grotto grotty grout grouty