conquer vs overthrow

conquer

verb
  • To defeat in combat; to subjugate. 

  • To overcome an abstract obstacle. 

  • To acquire by force of arms, win in war; to become ruler of; to subjugate. 

overthrow

verb
  • To bring about the downfall of (a government, etc.), especially by force. 

  • To throw (something) so that it goes too far. 

noun
  • A throw that goes too far. 

  • A run scored by the batting side when a fielder throws the ball back to the infield, whence it continues to the opposite outfield. 

  • A removal, especially of a ruler or government, by force or threat of force. 

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