skivvy vs underling

skivvy

noun
  • A prostitute. 

  • A close-fitting, long-sleeved T-shirt with a rolled collar. 

verb
  • To perform menial work; to do chores, like a servant. 

underling

noun
  • A low, wretched person. 

  • A subordinate, or person of lesser rank or authority. 

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