boater vs millinery

boater

noun
  • A straw hat, very stiff, with a flat brim and crown. 

  • Someone who travels by boat. 

  • One who works on a boat, especially as captain. 

millinery

noun
  • Women's hats. 

  • The business and work that a milliner engages in. 

  • A shop selling women's hats. 

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