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.
brainiac boronic barranca barranco brank bring brink bronc bronco baring boring barring bearing birring burring brung barong
brainiac morainic paranoiac chorionic
brain brainy bran brin bairn borane branny brawn brawny brine briny briony bruin buran burin