probing vs scavenging

probing

noun
  • The action of investigating or exploring. 

adj
  • That investigates or explores deeply; that attempts to elicit information that is concealed. 

scavenging

noun
  • The act of searching through refuse for useful material. 

adj
  • That eats carrion 

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