soldier's woundwort vs yockel

soldier's woundwort

noun
  • Achillea millefolium or common yarrow, a flowering plant widespread in the temperate Northern Hemisphere, formerly and sometimes used to stanch the flow of blood. 

yockel

noun
  • The yaffle or green woodpecker, Picus viridis. 

How often have the words soldier's woundwort and yockel occurred in a corpus of books? (source: Google Ngram Viewer )