running dog vs worker

running dog

noun
  • A lackey; a lapdog; an unprincipled person who helps or flatters other, more powerful and often evil people. 

worker

noun
  • A nonreproductive social insect, such as ant, bee, termite, or wasp. 

  • A person who performs labor for a living, especially manual labor. 

  • A female ant, bee, termite or wasp. 

  • A thread performing one instance of a particular task within a program. 

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