grammar school vs sports hall

grammar school

noun
  • Elementary school. 

  • A secondary school that stresses academic over practical or vocational education, until recent times open to those pupils who had passed the 11-plus examination. 

sports hall

noun
  • A building, or a room in a building, especially in a school, with facilities to play indoor sports. 

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