gymnasium vs primary school

gymnasium

noun
  • A type of secondary school in some European countries which typically prepares students for university. 

  • A large room or building for indoor sports. 

  • A public place or building where Ancient Greek youths took exercise, with running and wrestling grounds, baths, and halls for conversation. 

primary school

noun
  • A formal, obligatory kind of school that typically begins with nursery school or first grade and ends at fifth or sixth grade. 

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