precaution vs safeguard

precaution

verb
  • To take precaution against. 

  • To warn or caution beforehand. 

noun
  • A measure taken beforehand to ward off evil or secure good or success; a precautionary act. 

  • Previous caution or care; caution previously employed to prevent misfortune or to secure good 

safeguard

verb
  • To implement safeguarding. 

  • To escort safely. 

  • To protect, to keep safe. 

noun
  • A safe-conduct or passport, especially in time of war. 

  • Something that serves as a guard or protection; a defense. 

  • One who, or that which, defends or protects; defence; protection. 

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