alien vs built-in

alien

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. 

verb
  • To estrange; to alienate. 

  • To transfer the ownership of something. 

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

  • Very unfamiliar, strange, or removed. 

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

built-in

adj
  • Being an essential and permanent part of something. 

  • Being an included feature that normally comes as an extra. 

  • Constructed as a non-detachable part of a larger structure. 

noun
  • Anything (such as a piece of furniture, or a software feature) that is built in, not added as an extra. 

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