cruller vs dunker

cruller

noun
  • A donut in the form of a twisted ring. 

dunker

noun
  • A biscuit that is suitable for dunking in a cup of tea. 

  • A kind of sonobuoy. 

  • Any snack food suitable for dunking in sauce. 

  • A person tasked with performing or training others in slam dunks. 

  • Someone who dunks. 

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