protection vs shielding

protection

noun
  • The process of keeping (something or someone) safe. 

  • Coverage. 

  • A means of keeping or remaining safe. 

  • The state of being safe. 

  • An instance of a security token associated with a resource (such as a file). 

  • Restrictions on foreign competitors which limit their ability to compete with domestic producers of goods or services. 

  • A means, such as a condom, of preventing pregnancy or sexually transmitted disease. 

  • Immunity from harm, obtained by illegal payments, as bribery or extortion. 

shielding

noun
  • Action done by the person with the ball to protect the ball from the defender; the person concerned keeps his body between the ball and the defender. 

  • The situation, in NMR spectroscopy, in which a local magnetic field is weakened by the presence of neighbouring nuclei 

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