freelance vs permanent

freelance

adj
  • Of, or relating to a freelance; without employment contract. 

verb
  • To produce or sell services as a freelance. 

  • To work as a freelance. 

noun
  • A medieval mercenary. 

  • Someone who sells their services to clients without a long-term employment contract. 

permanent

adj
  • Without end, eternal. 

  • Lasting for an indefinitely long time. 

noun
  • A card whose effects persist beyond the turn on which it is played. 

  • A chemical hair treatment imparting or removing curliness, whose effects typically last for a period of weeks; a perm. 

  • Given an n⨯n matrix a_ij,, the sum over all permutations 𝜋, of ∏ᵢ₌₁ⁿa_i𝜋(i). 

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