beset vs pounce upon

beset

verb
  • To attack or assail, especially from all sides. 

  • Of a ship, to get trapped by ice. 

  • To surround or hem in. 

  • To decorate something with jewels etc. 

pounce upon

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