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.
cart caret carat carte carrot carate card kart crit curt carroty cruet caird cared crate quart court karat curet cardio karate create garret croute curate cardia curite caried garote quarte quarto garrote cowrite garotte cowrote curette cardiae carried grit cord grat garrotte grot cred crud curd grout greet cured groat kraut grate cored curdy creed crude crowd korat great griot garda krait guard kurta credo cried quirt
art boart fart hart heart cart kart quart mart part peart dart tart wart chart