tag vs watermark

tag

verb
  • To mark (something) with one’s tag. 

  • To label (something). 

  • To remove dung tags from a sheep. 

  • To put a runner out by touching them with the ball or the ball in a gloved hand. 

  • To follow closely, accompany, tag along. 

  • To catch and touch (a player in the game of tag). 

  • To fit with, or as if with, a tag or tags. 

  • to have sex with someone (especially a man of a woman) 

  • To fasten; to attach. 

  • To mark with a tag (metadata for classification). 

  • To hit the ball hard. 

noun
  • Graffiti in the form of a stylized signature particular to the artist. 

  • Something mean and paltry; the rabble. 

  • A sheep in its first year. 

  • The last line (or last two lines) of a song's chorus that is repeated to indicate the end of the song. 

  • Any short peptide sequence artificially attached to proteins mostly in order to help purify, solubilize or visualize these proteins. 

  • A children's chasing game in which one player (known as "it") attempts to touch another, who then becomes "it". 

  • An instance of touching the baserunner with the ball or the ball in a gloved hand to rule him "out." 

  • The last scene of a TV program, often focusing on the program's subplot. 

  • A person's name. 

  • Any slight appendage, as to an article of dress; something slight hanging loosely. 

  • A type of cardboard. 

  • A keyword, term, or phrase associated with or assigned to data, media, and/or information enabling keyword-based classification; often used to categorize content. 

  • The end, or catchword, of an actor's speech; cue. 

  • A small label. 

  • A skin tag, an excrescence of skin. 

  • An attribution in narrated dialogue (eg, "he said") or attributed words (e.g. "he thought"). 

  • A vehicle number plate; a medal bearing identification data (animals, soldiers). 

  • A dangling lock of sheep's wool, matted with dung; a dung tag. 

  • A decoration drawn over some Hebrew letters in Jewish scrolls. 

  • A metallic binding, tube, or point, at the end of a string, or lace, to stiffen it. 

  • A piece of markup representing an element in a markup language. 

watermark

verb
  • To mark paper with a watermark. 

  • To mark a datafile with a digital watermark. 

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

  • 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. 

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