desert boot vs wader

desert boot

noun
  • A type of laced ankle-high boots made of soft suede with a crepe sole 

wader

noun
  • A waterproof boot that comes up to the hip, used by fishermen, etc. 

  • One who wades. 

  • A long-legged bird associated with wetland or coastal environments. 

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