dissension vs lie-in

dissension

noun
  • An act of expressing dissent, especially spoken. 

  • Strong disagreement; a contention or quarrel; discord. 

lie-in

noun
  • A form of protest where a group of people lie down in a public area. 

  • A period spent lying in bed for longer than usual after one has woken up. 

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