delayer vs slacker

delayer

noun
  • One who delays. 

  • A substance that is used to slow the rate of combustion of a solid rocket fuel so as to make it more controllable 

verb
  • To remove layers from; to strip away levels from. 

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 delayer and slacker occurred in a corpus of books? (source: Google Ngram Viewer )