incarceration vs internment

incarceration

noun
  • The act of confining, or the state of being confined; imprisonment. 

  • A constriction of the hernial sac, rendering it irreducible, but not great enough to cause strangulation. 

internment

noun
  • Confinement within narrow limits, as of foreign troops, to the interior of a country. 

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