cloak vs overlay

cloak

noun
  • A blanket-like covering, often metaphorical. 

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

verb
  • To cover up, hide or conceal. 

  • To render or become invisible via futuristic technology. 

  • To cover as with a cloak. 

overlay

noun
  • A covering over something else. 

  • A block of program code that is loaded over something previously loaded, so as to replace the functionality. 

  • A decal attached to a computer keyboard to relabel the keys. 

  • A pop-up covering an existing part of the display. 

  • A horse going off at higher odds than it appears to warrant, based on its past performances. 

  • A piece of paper pasted upon the tympan sheet to improve the impression by making it stronger at a particular place. 

  • A cravat. 

  • Odds which are set higher than expected or warranted. Favorable odds. 

verb
  • To lay, spread, or apply something over or across; cover. 

  • To put an overlay on. 

  • simple past tense of overlie 

  • To overwhelm; to press excessively upon. 

  • To bet too much money on. 

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