observant vs wideawake

observant

adj
  • Diligently attentive in observing a law, custom, duty or principle; regardful; mindful. 

  • Alert and paying close attention; watchful. 

wideawake

noun
  • A type of hat with a broad brim made of black or brown felt. 

  • A bird, the sooty tern. 

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