goblin vs hobgoblin

goblin

noun
  • One of various hostile supernatural creatures, now especially (fantasy literature) a malevolent and grotesque diminutive humanoid, often associated with orcs or trolls. 

hobgoblin

noun
  • A small, ugly goblin that makes trouble for humans. 

  • A source of dread, fear or apprehension; a bugbear. 

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