bug-a-boo vs colossus

bug-a-boo

noun
  • A mythical, nocturnal creature; a hobgoblin. 

  • Any imagined fear or threat, or a fear presumed larger than it really is. 

colossus

noun
  • Any creature or thing of gigantic size. 

  • Somebody or something very greatly admired and respected. 

  • A statue of gigantic size. The name was especially applied to certain famous statues in antiquity, as the Colossus of Nero in Rome and the Colossus of Rhodes, one of the Seven Wonders of the Ancient World. 

How often have the words bug-a-boo and colossus occurred in a corpus of books? (source: Google Ngram Viewer )