film vs underlay

film

noun
  • A thin layer of some substance; a pellicle; a membranous covering, causing opacity. 

  • A medium used to capture images in a camera. 

  • A slender thread, such as that of a cobweb. 

  • A visual art form that consists of a sequence of still images preserved on a recording medium to give the illusion of motion; movies generally. 

verb
  • To cover or become covered with a thin skin or pellicle. 

  • To visually record (activity, or a motion picture) in general, with or without sound. 

  • To record (activity, or a motion picture) on photographic film. 

underlay

noun
  • A layer (of earth, etc.) that lies under another; substratum. 

  • A piece of paper pasted under woodcuts, stereotype plates, etc. in a form, to bring them up to the necessary level for printing. 

  • Lyrics; or more specifically, the way in which lyrics are assigned to musical notes. 

  • Anything that is underlaid. 

  • A soft floor covering that lies under a carpet. 

verb
  • To lay (something) underneath something else; to put under. 

  • To put a tap on (a shoe). 

  • simple past tense of underlie 

  • To provide a support for something; to raise or support by something laid under. 

  • To incline from the vertical. 

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