keychain vs pendant

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. 

pendant

noun
  • A piece of jewellery which hangs down as an ornament, especially worn on a chain around the neck. 

  • A short rope hanging down, used to attach hooks for tackles; a pennant. 

  • A lamp hanging from the roof. 

  • A long narrow flag at the head of the principal mast in a royal ship. 

  • The dangling part of an earring. 

  • An ornament of wood or of stone hanging downwards from a roof. 

  • One of a pair; a counterpart. 

  • A supporting post attached to the main rafter. 

  • The stem and ring of a watch, by which it is suspended. 

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