ballerina vs go-go dancer

ballerina

noun
  • A female ballet dancer. 

  • A male ballet dancer; Synonym of ballerino 

  • A ballet flat shoe. 

go-go dancer

noun
  • A dancer who entertains patrons at a nightclub, especially a young and scantily dressed woman. 

How often have the words ballerina and go-go dancer occurred in a corpus of books? (source: Google Ngram Viewer )