dingbat vs whosit

dingbat

noun
  • A small device or gadget, the correct term for which is forgotten or unknown. 

  • Anything that can be thrown or swung with force against something else. 

  • An architectural style of apartment building, where the second storey overhangs an area for parking cars. 

  • A special ornamental typographical symbol, such as a bullet, an arrow, a pointing hand etc. 

  • A kind of word puzzle involving pictures or typography that hint at the solution. 

  • A silly, crazy or stupid person. 

whosit

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

  • A specific person (used in a vague way to refer to someone whose name one cannot recall) 

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