overcoat vs parka

overcoat

noun
  • A heavy garment worn over other clothes, for protection from cold or weather. 

verb
  • To apply an exterior coating to. 

parka

noun
  • A long jacket with a hood which protects the wearer against rain and wind. 

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