banking vs declivity

banking

noun
  • A horizontal turn. 

  • The occupation of managing or working in a bank. 

  • The practice of assisting a train up a steep incline (called a bank) with another locomotive at the rear. 

  • Investment banking. 

  • The business of managing a bank. 

  • A mechanical component to prevent vibration in a timepiece, etc. 

declivity

noun
  • A downward bend in a path. 

  • The downward slope of a hill; the downward slope of a curve. 

  • An inward curve of the exoskeleton of an insect, such as between body segments; a segment of an insect's body where the exoskeleton curves inward. 

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