monolith vs pylon

monolith

noun
  • A large, single block of stone which is a natural feature; or a block of stone or other similar material used in architecture and sculpture, especially one carved into a monument in ancient times. 

  • A substrate having many tiny channels that is cast as a single piece, which is used as a stationary phase for chromatography, as a catalytic surface, etc. 

  • A dead tree whose height and size have been reduced by breaking off or cutting its branches. 

  • Anything massive, uniform, and unmovable, especially a towering and impersonal cultural, political, or social organization or structure. 

verb
  • To cast (one or more concrete components) in a single piece with no joints. 

  • To reduce the height and size of (a dead tree) by breaking off or cutting its branches. 

  • To create (something) as, or convert (one or more things) into, a monolith. 

pylon

noun
  • An obelisk. 

  • An orange marker designating one of the four corners of the end zone in American football. 

  • A traffic cone. 

  • A rigid prosthesis for the lower leg. 

  • A starting derrick for an aeroplane. 

  • A tower-like structure, usually one of a series, used to support high-voltage electricity cables. 

  • A lighting mast; a freestanding support for floodlights. 

  • A structure used to mount engines, missiles etc., to the underside of an aircraft wing or fuselage. 

  • A post, tower, etc. as on an aerodrome, or flying ground, serving to bound or mark a prescribed course of flight. 

  • A gateway to the inner part of an Ancient Egyptian temple. 

  • A tall steel or concrete tower from which cables are strung. 

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