masthead vs watermark

masthead

noun
  • The logo of a broadcaster used in an ident. 

  • The top of a mast. 

  • A list of a newspaper or other periodical's main staff, contributing writers, publisher, circulation, advertising rates etc. 

  • The title (normally in a large and distinctive font) of a newspaper or other periodical at the top of the front page; (by extension) the publication itself or the rights to it. 

verb
  • To send to the masthead as a punishment. 

  • To furnish (a newspaper) with a masthead. 

watermark

noun
  • A logo superimposed on a digital image, a television broadcast, etc. 

  • A mark indicating the level to which water has risen. 

  • A translucent design impressed on the surface of paper and visible when the paper is held to the light. 

  • A value stored in a datafile to ensure its integrity, so that if the file's contents are changed then the watermark will no longer match the contents. 

verb
  • To mark paper with a watermark. 

  • To mark a datafile with a digital watermark. 

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