house arrest vs internment

house arrest

noun
  • Confinement of a person to his or her residence, sometimes with a limited travel allowance, ordered by a judge or other authority as a more lenient alternative to imprisonment. 

internment

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

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