adapter vs appurtenance

adapter

noun
  • One who adapts a thing, e.g. a play. 

  • Specifically, a device that allows one format of plug to be used with a different format of socket. 

  • Specifically, an AC adapter: a device that reduces voltage and converts AC to DC to allow a battery-powered device to use mains power. 

  • A device or application used to achieve operative compatibility between devices that otherwise are incompatible. 

  • Specifically, a device that permits two, three, or more plugs to be used at a single electrical power point. 

  • One who is capable of adapting to differing situations. 

appurtenance

noun
  • That which appertains; an appendage to something else; an addition. 

  • Equipment used for some specific task; gear. 

  • A subordinate interest in land which benefits a principal estate, which cannot be detached from or held separately to that estate; an appurtenant interest. 

  • A modifier that is appended or prepended to another word to coin a new word that expresses belonging. 

  • The state or quality of being an appurtenance. 

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