bocage vs sward

bocage

sward

noun
  • The rind of bacon or pork; also, the outer covering or skin of something. 

  • A homosexual man. 

  • Earth which grass has grown into the upper layer of; greensward, sod, turf; (countable) a portion of such earth. 

  • An expanse of land covered in grass; a lawn or meadow. 

verb
  • Of ground, etc.: to be covered with sward; to develop a covering of sward. 

  • To cover (ground, etc.) with sward. 

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