anklet vs armband

anklet

noun
  • A piece of jewelry/jewellery, resembling a bracelet but worn around the ankle. 

  • An ankle sock. 

armband

noun
  • A band worn around the arm, usually to symbolize protest or mourning. 

  • An inflatable band worn round the arms to keep afloat in water 

  • A band worn around the arm of the captain of a team. 

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