bracelet vs keychain

bracelet

noun
  • A band or chain worn around the wrist as jewelry/jewellery or an ornament. 

  • A piece of defensive armour for the arm. 

  • The strap of a wristwatch, used to secure it around the wrist. 

verb
  • To surround with, or as if with, a bracelet; to ring or encompass. 

keychain

noun
  • An ornamental piece holding such a chain or ring. 

  • A chain or ring to which a key may be attached. 

  • A digital repository for the storage of cryptographic keys. 

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