built-in vs member

built-in

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

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. 

member

noun
  • An element of a set. 

  • A file stored within an archive file. 

  • the judge or adjudicator in a consumer court. 

  • The penis. 

  • A part of a whole. 

  • Part of an animal capable of performing a distinct office; an organ; a limb. 

  • One who officially belongs to a group. 

  • Either of the two parts of an algebraic equation, connected by the equality sign. 

  • A part of a discourse or of a period, sentence, or verse; a clause. 

  • One of the propositions making up a syllogism. 

  • A function or piece of data associated with each separate instance of a class. 

  • friend 

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