drowsy vs tired

drowsy

adj
  • Inclined to drowse; heavy with sleepiness 

  • Causing someone to fall sleep or feel sleepy; lulling; soporific. 

  • Dull; stupid. 

  • Boring. 

tired

adj
  • In need of some rest or sleep. 

  • ineffectual; incompetent 

  • Fed up, annoyed, irritated, sick of. 

  • Overused, cliché. 

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