listening vs observant

listening

adj
  • Of something or someone that listens. 

  • Of an action that is performed with caution and attention to sounds. 

  • Of something that is used in order to hear or to improve the ability to hear. 

noun
  • Skill or ability of perceiving spoken language. 

  • Action of the verb listening 

  • An educational exercise involving listening 

observant

adj
  • Alert and paying close attention; watchful. 

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

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