alien vs internal

alien

adj
  • Pertaining to extraterrestrial life; typical of an extraterrestrial creature. 

  • Not belonging to the same country, land, or government, or to the citizens or subjects thereof; foreign. 

  • Very unfamiliar, strange, or removed. 

verb
  • To estrange; to alienate. 

  • To transfer the ownership of something. 

noun
  • Any life form of extraterrestrial or extradimensional origin. 

  • A foreigner residing in a country. 

  • A person, animal, plant, or other thing which is from outside the family, group, organization, or territory under consideration. 

  • One excluded from certain privileges; one alienated or estranged. 

internal

adj
  • Of the inner nature of a thing. 

  • Within the body. 

  • Concerned with the domestic affairs of a nation, state or other political community. 

  • Applied or intended for application through the stomach by being swallowed. 

  • Concerned with the non-public affairs of a company or other organisation. 

  • Attending a university as well as taking its examinations. 

  • Of or situated on the inside. 

  • Experienced in one's mind; inner rather than expressed. 

  • Present or arising within an organism or one of its parts. 

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