caution vs nerve

caution

verb
  • To warn; to alert, advise that caution is warranted. 

  • To give a yellow card 

noun
  • A formal warning given as an alternative to prosecution in minor cases. 

  • Security; guaranty; bail. 

  • A yellow card. 

  • Prudence when faced with, or when expecting to face, danger; care taken in order to avoid risk or harm. 

  • A careful attention to the probable effects of an act, in order that failure or harm may be avoided. 

nerve

noun
  • A neuron. 

  • The elastic resistance of raw rubber or other polymers to permanent deformation during processing. 

  • mental agitation caused by fear, stress or other negative emotions. 

  • A vein in a leaf; a grain in wood. 

  • Patience; stamina; endurance, fortitude. 

  • A bundle of neurons with their connective tissue sheaths, blood vessels and lymphatics. 

  • Courage; boldness; audacity; gall. 

  • One's neural structures considered collectively as, and conceptually equated with, one's psyche; 

verb
  • May their example nerve us to face the enemy. 

  • To give strength; to supply energy or vigour. 

  • To give courage. 

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