bulwark vs landing stage

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. 

landing stage

noun
  • A floating platform attached at one end to a wharf so as to rise and fall with the tide, and thus facilitate passage between the wharf and a vessel lying beside the stage. 

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