eggar vs egger

eggar

noun
  • Any moth of the family Lasiocampidae. 

egger

noun
  • An eggar moth; any of various species of family Lasiocampidae, especially the oak eggar-moth, Lasiocampa quercus. 

  • One who eggs or incites. 

  • One who gathers eggs. 

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