adapter vs attachment

adapter

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

  • 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. 

  • One who is capable of adapting to differing situations. 

attachment

noun
  • A device attached to a piece of equipment or a tool. 

  • The means by which something is physically attached. 

  • Taking a person's property to satisfy a court-ordered debt. 

  • The act or process of (physically or figuratively) attaching. 

  • A strong bonding with or fondness for someone or something. 

  • A file sent along with a message, usually an email. 

  • The act or process by which any (downward) leader connects to any available (upward) streamer in a lightning flash. 

  • A dependence, especially a strong one. 

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