fringing reef vs scar

fringing reef

noun
  • A completely shallow coral reef adjacent to a coast. 

scar

noun
  • A rock in the sea breaking out from the surface of the water. 

  • A permanent mark on the skin, sometimes caused by the healing of a wound. 

  • A cliff or rock outcrop. 

  • A bare rocky place on the side of a hill or mountain. 

  • A permanent negative effect on someone's mind, caused by a traumatic experience. 

  • Any permanent mark resulting from damage. 

  • A marine food fish, the scarus or parrotfish (family Scaridae). 

verb
  • To mark the skin permanently. 

  • To form a scar. 

  • To affect deeply in a traumatic manner. 

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