exclusion vs shielding

exclusion

noun
  • The act of excluding or shutting out; removal from consideration or taking part. 

  • An item not covered by an insurance policy. 

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