childhood vs superannuation

childhood

noun
  • The state of being a child. 

  • The time during which one is a child, from between infancy and puberty. 

  • The early stages of development of something. 

superannuation

noun
  • A retirement benefit fund, an accumulation of regular deductions from one′s wage or salary while employed and similar regular contributions from the employer, usually administered by an independent entity; a pension. 

  • The condition or of being superannuated; old age or obsolescence. 

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