cloak vs curtain

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. 

curtain

verb
  • To hide, cover or separate as if by a curtain. 

  • To cover (a window) with a curtain; to hang curtains. 

noun
  • Death. 

  • That part of a wall of a building which is between two pavilions, towers, etc. 

  • A piece of cloth covering a window, bed, etc. to offer privacy and keep out light. 

  • A similar piece of cloth that separates the audience and the stage in a theater. 

  • The beginning of a show; the moment the curtain rises. 

  • The flat area of wall which connects two bastions or towers; the main area of a fortified wall. 

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