Stakhanovite vs workhorse

Stakhanovite

noun
  • An extremely productive or hard-working worker, especially in the former USSR, who may earn special rewards; a workaholic. 

adj
  • Pertaining to a Stakhanovite; heroically hard-working. 

workhorse

noun
  • Anyone or anything that does a lot of work; something or someone who works consistently or regularly. 

  • A horse used primarily for manual labor; a draft horse. 

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