social security vs superannuation

social security

noun
  • A specific such social benefit providing income in retirement or disability. 

  • Those benefits paid under such a system. 

  • A system whereby the state either through general or specific taxation provides various benefits to help ensure the wellbeing of its citizens. 

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 social security and superannuation occurred in a corpus of books? (source: Google Ngram Viewer )