abrogate vs countermand

abrogate

verb
  • To put an end to; to do away with. 

  • To block a process or function. 

  • To annul by an authoritative act; to abolish by the authority of the maker or her or his successor; to repeal; — applied to the repeal of laws, decrees, ordinances, the abolition of customs, etc. 

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. 

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