closing vs pioneer

closing

noun
  • The end or conclusion of something. 

  • In morphology, the erosion of the dilation of a set. 

  • The final procedure in a house sale, when documents are signed and recorded. 

  • The act by which something is closed. 

adj
  • Pertaining to the finish or ending of a series of events; occurring at the end or after all others. 

pioneer

noun
  • A person or other entity who is first or among the earliest in any field of inquiry, enterprise, or progress. 

  • A member of a children’s organization operated by the Communist Party, typically in the second of three stages toward becoming an member of the Party itself. 

  • One who goes before, as into the wilderness, preparing the way for others to follow. 

  • Some people will consider their national heroes to be pioneers of civilization. 

  • A member of any of several European organizations advocating abstinence from alcohol. 

verb
  • To be the first to do or achieve (something), preparing the way for others to follow. 

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