Even the verbal GRE is composed of several parts (such as reading comprehension, analogies and antonyms), it is essentially a vocabulary test. If you have a wide vocabulary, you will do well. Simple as that. There are hundreds of thousands of words in English and only a relatively small proportion of them are used in everyday life, film or television. So do not be surprised if you open a practice GRE test and see some words I never imagined existed in English. Some of these words are rarely used and probably never need them in the studio, if you're interested in the thesis on obscure English vocabulary.
However , if a graduate school of your choice wants to take the GRE, it is possible in your best interest to improve your chances of getting a good GRE verbal score.