lamppost vs sidelight

lamppost

noun
  • The pole that holds up a light so it can illuminate a wide area, such as holds up a streetlight. 

  • A tall, thin person. 

sidelight

noun
  • A light found at the side of something; especially of a vehicle. 

  • A piece of incidental information that helps one understand a subject. 

  • A window found at one or both sides of a door. 

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