descending vs downtick

descending

noun
  • A descent. 

adj
  • Ordered such that each element is less than or equal to the previous element. 

  • Moving or sloping downwards. 

  • Becoming lower in pitch. 

  • Causing a sequence to follow a descending order. 

downtick

noun
  • A small decrease or downward change in something that has been steady or rising. 

  • A stock market transaction or quote at a price below a preceding one. 

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