Vocabol is a GRE dictionary which enables student to use mobile phone to build vocabulary and prepare for exams like GRE, GMAT, and CAT. It contains about 3700 words; each word is with definition, synonym, antonym and sentence. You can customize to view definition, synonym, antonym, and sentence individually or at same time. You can mark each word as learned. You can also search for particular word and bookmark important words. There are about 1200 questions of antonym, 750 questions of Analogies and 250 questions on sentence completion. Small and precise explanation provided for analogies and sentence completion answers.