couch potato vs slacker

couch potato

noun
  • A person who spends a lot of time sitting or lying down, often watching television, eating snacks or drinking alcohol. 

slacker

noun
  • One who procrastinates or is lazy. 

  • A person lacking a sense of direction in life; an underachiever. 

  • A user of the Slackware Linux distribution. 

  • A member of a certain 1990s subculture associated with Generation X. 

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