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.
greet greed great greedy garret grot grat grit gored grout creed griot curet caret groat grade grate gride cruet create grouty grotto grotty garote gourde garred gritty garrote garotte curette garrotte cart cred crit curt grad grid kart
greet ret breed ferret ferrety freed fret hereat buret creed jerreed rede preed surety terete treat tret whereat hereto brede curet beret arete rete reed jereed caret cruet barret greed garret great pardee pureed dreed terret treed turret whereto
gree gore grew grey grue agree geekier ogre reeker reekier