engine compartment vs engine room

engine compartment

noun
  • synonym of engine bay 

engine room

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

  • The front row. 

  • The midfield. 

  • The pair of locks in a team. 

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

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