nigger lover vs woolly-head

nigger lover

noun
  • A white person considered excessively fond towards, protective of, or considerate to blacks, especially (historical) an abolitionist as considered to be a race traitor. 

woolly-head

noun
  • Synonym of abolitionist: an activist or politician opposed to slavery. 

  • A woolly-headed person, particularly (potentially offensive) a black or Arab with Afro-textured hair. 

How often have the words nigger lover and woolly-head occurred in a corpus of books? (source: Google Ngram Viewer )