video recorder vs videocassette recorder

video recorder

noun
  • An electronic device for recording video signals, for example onto magnetic tape or videodisks. 

videocassette recorder

noun
  • An electronic device for recording and playing back television programs and movies (featuring visual images and sound) on a videocassette that can be attached to a television set. 

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