censor vs gag

censor

verb
  • To review for, and if necessary to remove or suppress, content from books, films, correspondence, and other media which is regarded as objectionable (for example, obscene, likely to incite violence, or sensitive). 

noun
  • One of the two magistrates who originally administered the census of citizens, and by Classical times (between the 8th century B.C.E. and the 6th century C.E.) was a high judge of public behaviour and morality. 

  • A high-ranking official who was responsible for the supervision of subordinate government officials. 

  • A college or university official whose duties vary depending on the institution. 

  • A hypothetical subconscious agency which filters unacceptable thought before it reaches the conscious mind. 

  • An official responsible for the removal or suppression of objectionable material (for example, if obscene or likely to incite violence) or sensitive content in books, films, correspondence, and other media. 

gag

verb
  • To restrain someone's speech without using physical means. 

  • To restrain someone's speech by blocking his or her mouth. 

  • To cause to heave with nausea. 

  • To pry or hold open by means of a gag. 

  • To choke; to retch. 

  • To experience the vomiting reflex. 

  • To astonish (someone); to be at a loss for words. 

noun
  • A joke or other mischievous prank. 

  • Mycteroperca microlepis, a species of grouper. 

  • Any suppression of freedom of speech. 

  • An order or rule forbidding discussion of a case or subject. 

  • A device to restrain speech, such as a rag in the mouth secured with tape or a rubber ball threaded onto a cord or strap. 

  • a device or trick used to create a practical effect; a gimmick 

  • A convulsion of the upper digestive tract. 

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