lapwing vs shithead

lapwing

noun
  • A silly man. 

  • The northern lapwing (Vanellus vanellus). 

  • Any of several medium-sized wading birds belonging to the subfamily Vanellinae, within family Charadriidae. 

shithead

noun
  • A stupid or contemptible person. 

  • A card game, the aim of which is to lose one's cards. 

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