scarp vs serac

scarp

noun
  • The steep artificial slope below a fort's parapet. 

  • A cliff at the edge of a plateau or ridge caused by erosion or faulting; the steeper side of an escarpment. 

verb
  • to cut, scrape, erode, or otherwise make into a scarp or escarpment 

serac

noun
  • A sharp tower of ice formed by intersecting crevasses of a glacier. 

  • Often sérac: a hard, cone-shaped, pale green, strongly flavoured cheese from Switzerland made from skimmed cowmilk and blue fenugreek (Trigonella caerulea); Schabziger, Sapsago. It is usually eaten grated, mixed with butter, or in a fondue. 

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