roughneck vs tough case

roughneck

noun
  • Someone with rough manners; a rowdy or uncouth person. 

  • An ironworker; a dirty or low-paid worker, a labourer. 

  • A labourer on an oil rig. 

verb
  • To work as a laborer on an oil rig. 

tough case

noun
  • A person who is difficult to work with. 

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