auspicate vs omen

auspicate

verb
  • To foreshow; to foretoken. 

  • To give a favorable turn to in commencing; to inaugurate; -- a sense derived from the Roman practice of taking the auspicium, or inspection of birds, before undertaking any important business. 

adj
  • Auspicious. 

omen

verb
  • To divine or predict from omens. 

  • To be an omen of. 

noun
  • A thing of prophetic significance. 

  • Something which portends or is perceived to portend either a good or evil event or circumstance in the future, or which causes a foreboding; a portent or augury. 

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