foray vs plunder

foray

noun
  • A sudden or irregular incursion in border warfare; hence, any irregular incursion for war or spoils; a raid. 

  • A brief excursion or attempt, especially outside one's accustomed sphere. 

verb
  • To participate in a foray. 

  • To do or attempt something outside one's typical area of expertise. 

plunder

noun
  • An instance of plundering. 

  • The loot attained by plundering. 

verb
  • To take by force or wrongfully; to commit robbery or looting, to raid. 

  • To take unexpectedly. 

  • To make extensive (over)use of, as if by plundering; to use or use up wrongfully. 

  • To take (goods) by pillage. 

  • To pillage, take or destroy all the goods of, by force (as in war); to raid, sack. 

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