move stealthily vs prowl

move stealthily

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. 

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