challenge vs command

challenge

noun
  • An attempt to take possession; a tackle. 

  • The act of appealing a ruling or decision of a court of administrative agency. 

  • An antagonization or instigation intended to convince a person to perform an action they otherwise would not. 

  • A bid to overcome something. 

  • The act of seeking to remove a judge, arbitrator, or other judicial or semi-judicial figure for reasons of alleged bias or incapacity. 

  • An act of seeking to have a certain person be declared not legally qualified to vote, made when the person offers their ballot. 

  • The act of a sentry in halting a person and demanding the countersign, or (by extension) the action of a computer system demanding a password, etc. 

  • A summons to fight a duel; also, the letter or message conveying the summons. 

  • A difficult task, especially one that the person making the attempt finds more enjoyable because of that difficulty. 

  • An attempt to have a work of literature restricted or removed from a public library or school curriculum. 

  • The opening and crying of hounds upon first finding the scent of their game. 

  • A judge's interest in the result of a case, constituting grounds for them to not be allowed to sit the case (e.g., a conflict of interest). 

verb
  • To question or demand the countersign from (one who attempts to pass the lines). 

  • To dare (someone). 

  • To invite (someone) to take part in a competition. 

  • To be difficult or challenging for. 

  • To call something into question or dispute. 

  • To object to the reception of the vote of, e.g. on the ground that the person is not qualified as a voter. 

  • To take (a final exam) in order to get credit for a course without taking it. 

  • To make a formal objection to a juror. 

  • To dispute (something). 

command

noun
  • The act of commanding; exercise or authority of influence. 

  • power of control, direction or disposal; mastery. 

  • A directive to a computer program acting as an interpreter of some kind, in order to perform a specific task. 

  • The right or authority to order, control or dispose of; the right to be obeyed or to compel obedience. 

  • An order to do something. 

  • Dominating situation; range or control or oversight; extent of view or outlook. 

  • A command performance. 

  • A position of chief authority; a position involving the right or power to order or control. 

  • A body or troops, or any naval or military force, under the control of a particular officer; by extension, any object or body in someone's charge. 

  • The degree of control a pitcher has over his pitches. 

verb
  • To order, give orders; to compel or direct with authority. 

  • To require with authority; to demand, order, enjoin. 

  • to dominate through ability, resources, position etc.; to overlook. 

  • To hold, to control the use of. 

  • To exact, compel or secure by influence; to deserve, claim. 

  • To have or exercise supreme power, control or authority over, especially military; to have under direction or control. 

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