thus and such vs whatnot

thus and such

noun
  • A placeholder or generic name for something. 

whatnot

noun
  • A small unspecified object; bric-a-brac (in plural) 

  • Other related objects or ideas. 

  • A freestanding set of shelves on which ornaments are displayed; an etagere. 

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