armband vs headband

armband

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

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

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

headband

noun
  • A hair-accessory, made of a flexible material and curved like a horseshoe, for holding one's hair back. 

  • A strip of fabric worn around the head. 

  • A strip of fabric attached to the top of the spine of a book; used as decoration and reinforcement. 

  • A thin slip of iron on the tympan of a printing-press. 

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