African-American vs nig-nog

African-American

noun
  • Any black person. 

  • A black American. 

adj
  • Of or pertaining to the culture of African-American people. 

  • An American who is of Sub-Saharan African ancestry. 

  • American and black. 

  • Of Black African descent. 

nig-nog

noun
  • A person of color, especially, a black person. 

  • A foolish person; hence, a raw and unskilled recruit. 

How often have the words African-American and nig-nog occurred in a corpus of books? (source: Google Ngram Viewer )