gaggle vs pep rally

gaggle

noun
  • Any group or gathering of related things. 

  • A group of geese when they are on the ground or on the water. 

verb
  • To make a noise like a goose; to cackle. 

pep rally

noun
  • A meeting or gathering for the purpose of instilling enthusiasm and motivation in attenders. 

  • An extracurricular school activity in which students gather to express support for the school sports team before a game. 

How often have the words gaggle and pep rally occurred in a corpus of books? (source: Google Ngram Viewer )