make certain vs noddle

make certain

verb
  • Synonym of make sure. 

noddle

verb
  • To nod repeatedly. 

noun
  • The head; the part of the body of an animal or human which contains the brain, mouth and main sense organs. 

  • The head as the seat of mental capacity or intellect. 

How often have the words make certain and noddle occurred in a corpus of books? (source: Google Ngram Viewer )