drop in the sea vs flyspeck

drop in the sea

noun
  • A very small or insignificant amount; something of little importance. 

flyspeck

noun
  • Anything tiny or insignificant. 

  • Housefly excrement, visible as a minuscule black dot. 

verb
  • To inspect in minute detail to ensure that something contains no flaws; nitpick. 

  • To bespeckle with tiny spatters of color. 

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