dipsomaniac vs pisshead

dipsomaniac

noun
  • A persistently drunken person; a drunkard. 

  • One with a morbid paroxysmal craving for alcohol; an alcoholic. 

pisshead

noun
  • A person who regularly overindulges in alcoholic drink. 

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