greybeard vs southernwood

greybeard

noun
  • A coarse earthenware vessel for holding liquor; a bellarmine. 

  • An old man. 

  • Any of the members of a group who have been there the longest, often implying experience. 

southernwood

noun
  • An aromatic shrub, Artemisia abrotanum, related to wormwood. 

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