bug-a-boo vs creature

bug-a-boo

noun
  • A mythical, nocturnal creature; a hobgoblin. 

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

creature

noun
  • An unidentified, mysterious, and often monstrous animal or being. 

  • A living being; an animal. 

  • A being subservient to or dependent upon another. 

  • A human. 

  • A created thing, whether animate or inanimate; a creation. 

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