circumvent vs obstruct

circumvent

verb
  • to avoid or get around something; to bypass 

  • to outwit or outsmart 

  • to surround or besiege 

obstruct

verb
  • To get in the way of so as to hide from sight. 

  • To impede, retard, or interfere with; hinder. 

  • To block or fill (a passage) with obstacles or an obstacle. See synonyms at block. 

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