circumcision vs female circumcision

circumcision

noun
  • The surgical removal of the clitoral hood of the clitoris; female circumcision. 

  • The surgical removal of the foreskin of the penis. 

  • The surgical removal of the clitoris; clitoridectomy, usually referred to as female genital mutilation. 

female circumcision

noun
  • The removal of the clitoral hood, the female prepuce cognate to the foreskin removed in the male equivalent. 

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