mummer vs ribald

mummer

noun
  • A person who dons a disguising costume, as for a parade or a festival. 

  • An actor in a pantomime; one who communicates entirely through gesture and facial expression. 

verb
  • Synonym of mum (“to act in pantomime or dumb show”) 

ribald

noun
  • An individual who is filthy or vulgar in nature. 

adj
  • Coarsely, vulgarly, or lewdly amusing; referring to sexual matters in a rude or irreverent way. 

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