Nihilism

This post has been so long in the making, I almost forgot why I was doing it. I originally set out to gather a day's worth of evidence to settle a long standing argument that has come up, but I found the more I searched, the more information and debates spawned to be mulled over. Finally, after countless books read and countless philosophy professors consulted, I present the difference between nihilism and existential nihilism.
Nihlism is simply defined as "the philisophical doctrine suggesting the negation of one or more meaningful aspects of life." So, this can simply be the rejection of validity of any set standard or system. For instance, believing that there is no morality and that it can not be inherently right or wrong to commit a crime is moral nihilism. This also works in multiple other forms, including politcal nihilism, an entirely different concept altogether.
When the word "nihilism" is uttered, it is most often assumed to mean existential nihilism, which is the belief that, effectively, there is no meaning to life whatsoever.
These two are NOT the same.
Nihilism is not the belief that there is no meaning to life. But, the belief that there is no meaning to life is a form of nihilism. Just like Protestantism and Catholicism are forms of Christianity, but Christianity is NOT Protestantism.
On that note, if someone is inquiring as to your religion and you answer "Christian" but, upon being asked if Catholic or Protestant, you respond "No, I'm a Christian," I feel as if I have the right to be annoyed.
I digress, the point of this all being, if I say the words "moral nihilist" and someone tells me that's incorrect, I will gladly give the 132 pages of resources and notes that explain the exact difference.