brant vs ironbound

brant

adj
  • smooth; unwrinkled 

  • steep, precipitous. 

noun
  • Any of several wild geese, of the genus Branta, that breed in the Arctic, but especially the brent goose, Branta bernicla. 

ironbound

adj
  • Rigid, unyielding. 

  • Bound with iron, ironclad. 

  • Rugged. 

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