academic institution vs cram school

academic institution

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

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

cram school

noun
  • A specialized school that trains students to meet particular goals, most commonly to pass the entrance examinations of high schools or universities. 

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