recession vs waning

recession

noun
  • The act or an instance of receding or withdrawing. 

  • A procedure in which an extraocular muscle is detached from the globe of the eye and reattached posteriorly. 

  • A period of low temperatures that causes a reduction in species; ice age. 

  • A period of reduced economic activity 

  • The ceremonial filing out of clergy and/or choir at the end of a church service. 

  • The act of ceding something back. 

waning

noun
  • The fact or act of becoming less or less intense or present; fading. 

  • The fact or act of becoming smaller. 

adj
  • Becoming weaker or smaller. 

  • Of the lunar phase: as it shrinks when viewed from the Earth. 

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