Introducing Vocabbusters Cartoon Vocabulary for the GRE This audio enhanced book is a fun way to learn GRE vocabulary. This free book is a sample of our full size books, Vocabbusters GRE Cartoon Vocabulary. Each word is illustrated in a creative cartoon that features clever mnemonics (memory strategies). Listen to the pronunciations and words used in context with the built-in audio. The combination of visuals, audio, and example sentences make the words "stick in your head." This book features 20 words commonly found on the GRE exam.