balmoral vs walking boot

balmoral

noun

  • A heavy walking shoe. 

  • A Scottish cap with a flat top and a plume but no brim; a blue bonnet. 

  • A figured woollen petticoat. 

  • An Oxford shoe. 

walking boot

noun

  • A hiking boot. 

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