audiotape vs compact cassette

audiotape

noun
  • A magnetic tape that stores analog sound for later playback on a tape player. 

  • Any of a cassette tape, eight-track tape, reel-to-reel tape, DAT, etc. 

verb
  • To record onto audiotape. 

compact cassette

noun
  • The standard cassette tape format introduced in 1963 by Philips; an audio cassette. 

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