engine room vs gymnasium

engine room

noun
  • The pair of locks in a team. 

  • The front row. 

  • A compartment on a ship in which the engine machinery is located. 

  • The midfield. 

  • The source of power in a team or other group. 

gymnasium

noun
  • A large room or building for indoor sports. 

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

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

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