sluggard vs slummock

sluggard

noun
  • A fearful or cowardly person, a poltroon. 

  • A person who is lazy, stupid, or idle by habit. 

  • A person slow to begin necessary work, a slothful person. 

slummock

noun
  • A slovenly person 

verb
  • To behave awkwardly or clumsily 

  • To behave lazily or indolently 

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