amulet vs idol

amulet

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

idol

noun
  • A graven image or representation of anything that is revered, or believed to convey spiritual power. 

  • A cultural icon, or especially popular person. 

  • A popular entertainer, usually young, captivating and attractive, and often female, with an image of being close to fans. 

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