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.
grotto grotty grot garotte grout groat griot garrotte grouty garote gritty garrote grit grat grody great grate greet carrot croute garret quarto carroty cowrote curette
grotto roto rotte garotte garrotte grotty