gathering vs quartet

gathering

noun
  • A group of people or things. 

  • A meeting or get-together; a party or social function. 

  • A section, a group of bifolios, or sheets of paper, stacked together and folded in half. 

  • The collection of produce, items, goods, etc.; the practice of collecting food from nature. 

  • A tumor or boil suppurated or maturated; an abscess. 

  • A charitable contribution; a collection. 

adj
  • That gathers together. 

quartet

noun
  • A group of four people or things, particularly 

  • A group of four musicians who perform classical music together. 

  • A group of four singers, usually males, who sings together in four-part harmony. 

  • A musical composition in four parts, each performed by a single voice or instrument. 

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