lithic vs rocky

lithic

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 

noun
  • A stone tool or projectile 

  • A medicine that prevents stone in the bladder. 

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

rocky

adj
  • In the style of rock music. 

  • Abounding in, or full of, rocks; consisting of rocks. 

  • Like a rock; rigid, solid. 

  • Having a habitat around or on rocks. 

  • Easily rocked; unstable. 

  • Encountering many problems; difficult, troubled; also, in danger or distress. 

  • Of a person: ill, or unsteady (for example, as a result of a shock). 

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