crag vs lithic

crag

noun
  • A rough, broken fragment of rock. 

  • A rocky outcrop; a rugged steep cliff or rock. 

  • A partially compacted bed of gravel mixed with shells, of the Pliocene to Pleistocene epochs. 

lithic

noun
  • A lithic fragment: a piece of another rock eroded down to sand size. 

  • A stone tool or projectile 

  • A medicine that prevents stone in the bladder. 

adj
  • Relating to rock 

  • Relating to stone 

  • Relating to lithium 

  • Relating to the formation of uric acid concretions (stones) in the bladder and other parts of the body 

  • pertaining to Native American culture before circa 8,500 BCE 

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