armband vs mourning

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. 

mourning

noun
  • Drapes or coverings associated with mourning. 

  • The traditional clothes worn by those who mourn (in Western societies, typically coloured black). 

  • Feeling or expressing sorrow over someone's death. 

  • The act of expressing or feeling sorrow or regret; lamentation. 

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