amulet vs effigy

amulet

noun
  • A kind of protective charm or ornament, often bearing magical symbols, worn for protection against ill will, negative influences, or evil spirits. 

effigy

noun
  • A likeness of a person. 

  • A dummy or other crude representation of a person, group or object that is hated. 

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