screening vs shielding

screening

noun
  • Action done by the serving team to prevent the opposing team from seeing the server and the flight path of the ball. 

  • The showing of a film 

  • Material removed by such a process; refuse left after screening sand, coal, ashes, etc. 

  • A method to identify a disease in a population which is not showing any symptoms of this disease. 

  • The process of checking or filtering. 

  • The examination and treatment of a material to detect and remove unwanted fractions 

  • shielding 

  • Mesh material that is used to screen (as in a "screen door"). 

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 screening and shielding occurred in a corpus of books? (source: Google Ngram Viewer )