Narcissistic Personality Disorder is complex and has a number of special terms for its vagaries in its glossary. Understanding them will dramatically help your comprehension of the disorder.
There is a whole glossary of terms that has evolved to describe the peculiarities of narcissism and narcissistic abuse. Some terms have been developed by mental health professionals and are more technical in nature, others by targets and survivors themselves. As with all languages, understanding the lingo gives a good understanding into the underlying culture of the narcissist.
One of the best glossary of terms has been compiled by Julie L Hall and is available here