nig-nog vs spade

nig-nog

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

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

spade

noun
  • A black person. 

  • A garden tool with a handle and a flat blade for digging. Not to be confused with a shovel which is used for moving earth or other materials. 

  • A playing card marked with the symbol ♠. 

  • A castrated man or animal. 

  • A cutting instrument used in flensing a whale. 

  • A hart or stag three years old. 

verb
  • To turn over soil with a spade to loosen the ground for planting. 

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