sitting tenant vs squatter

sitting tenant

noun
  • A tenant who is already in occupation of a premises, especially when there is a change of owner. The tenant is not evicted when the property is sold to a new owner. 

squatter

noun
  • A large-scale grazier and landowner. 

  • A poor vagrant; An illegal informal settler; hobo; beggar; One suffering from extreme poverty. 

  • One who occupied Crown land. 

  • One who squats, sits down idly. 

  • A squat toilet. 

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