Sometime in order to remember a new vocabulary word you need to tie it to something that will help you recall it. A trick used by ancient and medieval scholars is to invent some strange or unusual image, a pun on some oddball phrase in English, a popular song; anything. The more bizarre the better. When you need to recall that word, very often you can use the image or wordplay or whatever you've mentally attached to that word as a way to access it. With a little practice, it's remarkable how effectively you can use this technique to recall otherwise unfamiliar words. Gradually, you'll learn to remember the new words without the need to use the memory aid.