halcyon vs imperial

halcyon

noun
  • The dead body of such a bird, said in Tudor times to act as a weather vane when hung from a beam. 

  • A kingfisher whose nesting by the sea was said, in classical mythology, to cause the Gods to restrain the wind and waves. 

  • A tropical kingfisher of the genus Halcyon, such as the sacred kingfisher (Halcyon sancta) of Australia. 

adj
  • Pertaining to the halcyon or kingfisher. 

  • Calm, undisturbed, peaceful, serene. 

imperial

noun
  • A kind of dome, as in Moorish buildings. 

  • Any of several combinations of cards which score in this game. 

  • A crown imperial. 

  • A bottle of wine (usually Bordeaux) containing 6 liters of fluid, eight times the volume of a standard bottle. 

  • An outside seat on a diligence or carriage. 

  • A writing paper size measuring 30 × 22 inches, or printing paper measuring 32 × 22 inches. 

  • A variety of green tea. 

  • A card game differing from piquet in some minor details, and in having a trump. 

  • A tuft of hair on the lower lip (so called from its use by Napoleon III). 

adj
  • Related to an empire, emperor, or empress. 

  • Very grand or fine. 

  • Relating to the British imperial system of measurement. 

  • Of special, superior, or unusual size or excellence. 

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