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.
grit griot gritty grot crit grid grat grate greet krait groat grout gride great grotto grouty gardai garote garret grotty curite garotte garrote cowrite cart kart curt grad garrotte quart kraut korat cried karat cruet garda carte gourd crate greed carat gored curet guard grade caret grody court kurta quirt
writ brit forrit frit crit grit merit territ worrit