bulwark vs shack

bulwark

noun
  • The planking or plating along the sides of a nautical vessel above her gunwale that reduces the likelihood of seas washing over the gunwales and people being washed overboard. 

  • A defensive wall or rampart. 

  • A defense or safeguard. 

  • A breakwater. 

  • Any means of defence or security. 

verb
  • To fortify something with a wall or rampart. 

  • To provide protection of defense for something. 

shack

noun
  • Bait that can be picked up at sea. 

  • A crude, roughly built hut or cabin. 

  • Any poorly constructed or poorly furnished building. 

  • A drink, especially an alcoholic one. 

  • The room from which a ham radio operator transmits. 

verb
  • To live (in or with); to shack up. 

  • To wander as a vagabond or tramp. 

  • To drink, especially alcohol. 

  • To hibernate; to go into winter quarters. 

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