countermand vs impose

countermand

verb
  • To counteract, to act against, to frustrate. 

  • To recall a person or unit with such an order. 

  • To revoke (a former command); to cancel or rescind by giving an order contrary to one previously given. 

  • To cancel an order for (some specified goods). 

noun
  • An order to the contrary of a previous one. 

impose

verb
  • to enforce: compel to behave in a certain way 

  • To practice a trick or deception (on or upon). 

  • To arrange in proper order on a table of stone or metal and lock up in a chase for printing; said of columns or pages of type, forms, etc. 

  • To establish or apply by authority. 

  • To lay on, as the hands, in the religious rites of confirmation and ordination. 

  • to be an inconvenience (on or upon) 

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