paving vs revetment

paving

noun
  • The hard durable surface placed directly atop the ground, as on a street or sidewalk. 

  • Interior pavement, as in a cathedral. 

adj
  • Pertaining to the material used for pavement, or to the surface itself. 

revetment

noun
  • A layer of stone, concrete, or other hard material supporting the side of an embankment. 

  • An armoured building that provides protection against bombs. 

  • An ornamental facing, as on a common masonry wall, of marble, face brick, tiles, etc. 

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