night owl vs screech owl

night owl

noun
  • An owl (order Strigiformes) that is nocturnal. 

  • A musical instrument which imitates an owl's hoot, consisting of a receptacle partly filled with water and a mouthpiece that is blown into. 

  • One who goes to bed late, or stays up late at night or in the early hours of the morning. 

screech owl

noun
  • Any New World owl of genus Megascops. 

  • A common barn owl, of species Tyto alba, found almost worldwide. 

  • The mistle thrush (Turdus viscivorus). 

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