ferrous vs hefty

ferrous

adj
  • Of or containing iron. 

  • Of compounds of iron in which it has a valence or oxidation number of 2. 

hefty

adj
  • Strong; bulky. 

  • Heavy, strong, vigorous, mighty, impressive. 

  • Heavy, weighing a lot. 

  • Large. 

  • Possessing physical strength and weight; rugged and powerful; powerfully or heavily built. 

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