easterly vs tradewind

easterly

adj
  • Facing the east; directed towards the east. 

  • Located towards or in the east. 

  • Coming from the east. 

adv
  • From the east. 

  • In an eastward direction or position; towards the east. 

noun
  • Any persistent wind from the east (usually applied to broad currents or belts of easterly winds). 

tradewind

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