barricade vs obstacle

barricade

noun
  • An obstacle, barrier, or bulwark. 

  • A barrier constructed across a road, especially as a military defence 

  • A place of confrontation. 

verb
  • to close or block a road etc., using a barricade 

  • to keep someone in (or out), using a blockade, especially ships in a port 

obstacle

noun
  • Something that impedes, stands in the way of, or holds up progress, either physically or figuratively 

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