T-junction vs concourse

T-junction

noun
  • A similarly shaped section in a pipe, etc. 

  • An intersection of routes where one road terminates as it joins a (usually higher priority) road at approximately 90°. In most countries, a give way or stop road sign will be seen at a T-junction. 

concourse

noun
  • The running or flowing together of things; the meeting of things; confluence. 

  • An open space, especially in a park, where several roads or paths meet. 

  • Airport terminal. 

  • A large group of people; a crowd. 

  • A large open space in or in front of a building where people can gather, particularly one joining various paths, as in a rail station or airport terminal, or providing access to and linking the platforms in a railway terminus. 

How often have the words T-junction and concourse occurred in a corpus of books? (source: Google Ngram Viewer )