prospecting vs tailing

prospecting

noun
  • The act of one who prospects. 

tailing

noun
  • The act of following someone. 

  • A prolongation of current in a telegraph line, due to capacity in the line and causing signals to run together. 

  • The part of a projecting stone or brick inserted in a wall. 

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