letterbox vs receiver

letterbox

noun
  • A collection point for mail intended for onward delivery, a secure box or receptacle for this purpose. 

  • A hidden container that holds a logbook and rubber stamp, found by following clues as a form of recreation. 

  • A rectangular hole or slot. 

  • A delivery point for mail, a box, compartment or slot for this purpose. 

verb
  • To transfer a widescreen motion picture to home video formats while preserving the original aspect ratio, with the placing of black bars above and below the picture area. 

  • To hunt for letterboxes (containers with logbook and rubber stamp) by following clues. 

adj
  • Transferred to home video formats while preserving the original aspect ratio, having black bars above and below the picture area. 

receiver

noun
  • Something which receives some substance or object, in a general sense; a receptacle. 

  • A person or company appointed to settle the affairs of an insolvent entity. 

  • A person who attempts to return the serve. 

  • The part of a telephone handset contained in the earpiece; (hence) the handset itself; an earpiece. 

  • A swaption which gives its holder the option to enter into a swap in which they pay the floating leg and receive the fixed leg. 

  • A person who receives something in a general sense; a recipient. 

  • The part of a firearm containing the action. 

  • A person who accepts stolen goods. 

  • An official whose job is to receive taxes or other monies; a tax collector, a treasurer. 

  • A vessel for receiving and holding the products of distillation, or for containing gases. 

  • Any of several electronic devices that receive electromagnetic waves, or signals transmitted as such. 

  • An offensive player who catches the ball after it has been passed. 

  • A vessel for receiving the exhaust steam from the high-pressure cylinder before it enters the low-pressure cylinder, in a compound steam engine. 

  • An airtight vessel from which air is pumped in order to form a vacuum. 

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