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.
rock rocky roc reck ruck rack rook rick wrack wrick rooky wreck rickey rookie rec raku reek rake raki ryke rakee reeky rekey rogue roque wreak
bock hock jock cock lock mock knock nock pock rock sock dock chock shock yock