steppe vs sward

steppe

noun
  • A vast, cold, dry grass-plain. 

  • The grasslands of Eastern Europe and Asia. Similar to (North American) prairie and (African) savanna. 

sward

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

  • 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. 

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 steppe and sward occurred in a corpus of books? (source: Google Ngram Viewer )