utensil vs whatsit

utensil

noun
  • A useful small tool, implement, or vessel. 

  • He stocked up on old-style writing utensils. 

  • An instrument or device for domestic use, especially in the kitchen. 

whatsit

noun
  • A thing (used in a vague way to refer to something whose name one cannot recall, or that one is embarrassed to say) 

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