dragon vs nag

dragon

noun
  • Something very formidable or dangerous. 

  • In Western mythology, a gigantic beast, typically reptilian with leathery bat-like wings, lion-like claws, scaly skin and a serpent-like body, often a monster with fiery breath. 

  • A background process similar to a daemon. 

  • A Komodo dragon. 

  • The (historical) Chinese empire or the People's Republic of China. 

  • A transvestite man, or more broadly a male-to-female transgender person. 

  • A type of playing-tile (red dragon, green dragon, white dragon) in the game of mahjong. 

  • In Eastern mythology, a large, snake-like monster with the eyes of a hare, the horns of a stag and the claws of a tiger, usually beneficent. 

  • Any of various agamid lizards of the genera Draco, Physignathus or Pogona. 

  • A fierce and unpleasant woman; a harridan. 

  • A variety of carrier pigeon. 

  • A legendary serpentine or reptilian creature. 

  • A short musket hooked to a swivel attached to a soldier's belt; so called from a representation of a dragon's head at the muzzle. 

  • The constellation Draco. 

  • A luminous exhalation from marshy ground, seeming to move through the air like a winged serpent. 

nag

noun
  • A persistent, bothersome thought or worry. 

  • Someone or something that nags. 

  • An old, useless horse. 

  • A repeated complaint or reminder. 

  • A small horse; a pony. 

verb
  • To bother with persistent thoughts or memories. 

  • Anyone would think that I nagged at you, Amanda! (From Amanda! by Robin Klein) 

  • a nagging pain in his left knee 

  • To repeatedly remind or complain to (someone) in an annoying way, often about insignificant or unnecessary matters. 

  • The notion that he forgot something nagged him the rest of the day. 

  • To bother or disturb persistently in any way. 

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