greave vs jambeau

greave

noun
  • A piece of armour that protects the leg, especially the shin, and occasionally the tops of the feet. 

verb
  • To clean (a ship's bottom); to grave. 

jambeau

noun
  • A piece of armour for the leg (especially below the knee), a greave. 

  • A certain fish. 

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