abutment vs gangboard

abutment

noun
  • A construction that supports the ends of a bridge; a structure that anchors the cables on a suspension bridge. 

  • The part of a valley or canyon wall against which a dam is constructed. 

  • A fixed point or surface where resistance is obtained. 

  • The point of junction between two things, in particular a support, that abuts. 

  • That element that shares a common boundary or surface with its neighbor. 

  • The solid portion of a structure that supports the lateral pressure of an arch or vault. 

  • The tooth that supports a denture or bridge. 

  • Something that abuts, or on which something abuts. 

  • The state of abutting. 

gangboard

noun
  • A board or plank used as a temporary footbridge between a ship and a dockside or any gap such as scaffolding. 

  • The boards ending the hammock-nettings at either side of the entrance from the accommodation-ladder to the deck. 

  • A board or plank placed within or without the bulwarks of a vessel's waist for lookouts to walk or stand on. 

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