field boot vs wader

field boot

noun
  • a type of walking boot 

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 field boot and wader occurred in a corpus of books? (source: Google Ngram Viewer )