If you are looking for a list of the most frequent GRE words, you could check out the Tweak GRE Flashcards on the Google Play Store. (https://play.google.com/store/apps/details?id=com.tweakgreflashcards)

It has the 1000 most frequent GRE words arranged in clusters based on their common meaning. It's free and has no ads.

Happy Learning!