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.
catarrh cater coater cottar cuatro cattery cattier cautery cadre gator gater cuter cooter cotter couter cutter gaiter gaydar guitar quatre coterie cottier couture
catarrh tarre tarry starry tar