academic institution vs high school

academic institution

noun
  • An educational institution, dedicated to teaching and/or research. 

  • An educational institution, dedicated to higher education and research, that grants academic degrees. 

high school

noun
  • An institution which provides all or part of secondary education. 

  • Secondary school. 

How often have the words academic institution and high school occurred in a corpus of books? (source: Google Ngram Viewer )