crab louse vs sorehead

crab louse

noun
  • A parasitic insect, Pthirus pubis, that lives amongst the pubic hairs of humans and feeds on blood. 

sorehead

noun
  • Fowlpox. 

  • A politician who is dissatisfied through failure, lack of recognition, etc. 

  • A person who has a tendency to be angry or to feel offended. 

  • Infection in sheep by the nematode Elaeophora schneideri; elaeophorosis. 

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