If you want to enhance your vocabulary kindly please dont try to memorize the words...
If you will try to memorize you will feel shy to use it in sentences and hence you will loose your confidence you will always think of whether you have used the word according to its real meaning in the sentence or not, whether it suits the sentence or not, am I wrong or correct,???? these questions when arise to your mind you will not be able to use the words, the only solution to this problem is just read the newspaper for the sake of getting knowledge and when you read it with interest you will automatically get the vocabulary and structure of the sentence into your bones. read the editorial of different newspapers it will help you to get to know about different techniques of good writing.