cloak vs underlay

cloak

verb
  • To cover up, hide or conceal. 

  • To render or become invisible via futuristic technology. 

  • To cover as with a cloak. 

noun
  • A long outer garment worn over the shoulders covering the back; a cape, often with a hood. 

  • That which conceals; a disguise or pretext. 

  • A blanket-like covering, often metaphorical. 

  • A text replacement for an IRC user's hostname or IP address, making the user less identifiable. 

underlay

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. 

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

  • A soft floor covering that lies under a carpet. 

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