gnat vs pissant

gnat

noun
  • An annoying person. 

  • Any small insect of the order Diptera, specifically within the suborder Nematocera. 

pissant

noun
  • An insignificant person. 

  • A person who adheres strictly to a rule or policy despite current circumstances. 

  • A person seemingly incapable of focusing on anything but the trivial, especially in the sense of trivial or irrelevant criticism. 

  • An ant. 

adj
  • Insignificant or unimportant. 

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