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.
grat groat grate great grot grad grit carat garda grout krait crate kraut grade korat greet griot karat curate garret grotto karate garote create gritty grouty carate grotty gardai garotte garrote grid crit kart cart curt garrotte carte quart kurta gourd court curet greed grody caret gride gored guard cruet quirt
rat brat frat jurat carat grat karat korat prat derat drat