antiphony vs observation

antiphony

noun
  • alternate, or responsive ideas or opinions; juxtaposition 

  • alternate, or responsive singing by a choir split into two parts; a piece sung or chanted in this manner 

observation

noun
  • A remark or comment. 

  • The act of noting and recording some event; or the record of such noting. 

  • A realization of a random variable. 

  • A judgement based on observing. 

  • Performance of what is prescribed; adherence in practice; observance. 

  • A regime under which a subject is routinely observed. 

  • Philosophically as: the phenomenal presence of human being existence. 

  • The act of observing, and the fact of being observed (see observance) 

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