amulet vs superstition

amulet

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

superstition

noun
  • A belief or beliefs, not based on human reason or scientific knowledge, that events may be influenced by one's behaviour in some magical or mystical way. 

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