prowl vs towing

prowl

noun
  • The act of prowling. 

verb
  • To rove over, through, or about in a stealthy manner; especially, to search in, as for prey or booty. 

  • To idle; to go about aimlessly. 

towing

noun
  • The act by which something is towed. 

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