hardware vs oil rig

hardware

noun
  • Equipment. 

  • Electronic equipment. 

  • The part of a computer that is fixed and cannot be altered without replacement or physical modification; motherboard, expansion cards, etc. Compare software. 

  • Fixtures, equipment, tools and devices used for general-purpose construction and repair of a structure or object. Also such equipment as sold as stock by a store of the same name, e.g. hardware store. 

  • Metal implements. 

  • A firearm. 

  • Medals or trophies. 

oil rig

noun
  • A rig, consisting of platform and machinery, used to drill for oil and other petroleum products like natural gas. 

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