Here we categorize well-known Barrons GRE vocabulary into 20 groups. The original Barrons list wasn't so big, some new words have been added by GRE test takers year by year. Now it's near to 5000 in some web sites. We merged some popular editions and shrinked the list to 4000. Meanwhile we added online meaning matching and spelling practices as well as flash cards for each word. It's a handy free resource to speed up your GRE vocabulary preparation.