bellwether vs marker

bellwether

noun
  • Anything that indicates future trends. 

  • A stock or bond that is widely believed to be an indicator of the overall market's condition. 

  • The leading sheep of a flock, having a bell hung round its neck. 

marker

noun
  • A real or virtual objective, something to be aimed for. 

  • A counter, especially one used in card games. 

  • A felt-tipped pen, a marker pen. 

  • Synonym of IOU, an informal record of a debt. 

  • A gene or DNA sequence with a known location on a chromosome that can be used to identify individuals or species. 

  • A substance used as an indicator for diagnosis or other analysis, a biomarker. 

  • A personal favor owed to someone, whether written or not. 

  • A free or bound morpheme indicating a grammatical function. 

  • A sewing machine attachment that creases the fabric to mark a line 

  • Someone who assigns marks on tests, examinations, etc.; a grader. 

  • The soldier who forms the pilot of a wheeling column or marks the direction of an alignment. 

  • The ink marks or residue of a felt-tipped pen. 

  • A scorekeeper, especially one who tallies billiard scores. 

  • A player on defense used to mark one or more offensive players. 

  • A device that fires a paintball. 

  • A formal certification that a company was the first to approach a competition authority to reveal the existence of a cartel, generally entitling it to greater leniency during the cartel's dissolution and punishment. 

verb
  • To mark or write on (something) using a marker 

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