communicative vs covert

communicative

adj
  • Eager to communicate; talkative. 

covert

noun
  • A covering. 

  • A disguise. 

  • A feather that covers the bases of flight feathers. 

  • Area of thick undergrowth where animals hide. 

  • A hiding place. 

adj
  • Under coverture. 

  • Secret, surreptitious, concealed. 

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