employment vs livelihood

employment

noun
  • The work or occupation for which one is used, and often paid 

  • The act of employing 

  • An activity to which one devotes time 

  • The number or percentage of people at work 

  • A use, purpose 

  • The state of being employed 

livelihood

noun
  • A means of providing the necessities of life for oneself (for example, a job or income). 

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