forage vs grass

forage

verb
  • To search for and gather food for animals, particularly cattle and horses. 

  • To rampage through, gathering and destroying as one goes. 

  • To rummage. 

  • Of an animal: to seek out and eat food. 

noun
  • Fodder for animals, especially cattle and horses. 

  • An act or instance of foraging. 

grass

verb
  • To feed with grass. 

  • To bring to the grass or ground; to land. 

  • To act as a grass or informer, to betray; to report on (criminals etc) to the authorities. 

  • To lay out on the grass; to knock down (an opponent etc.). 

  • To cover with grass or with turf. 

  • To expose, as flax, on the grass for bleaching, etc. 

noun
  • Asparagus; "sparrowgrass". 

  • Marijuana. 

  • Sharp, closely spaced discontinuities in the trace of a cathode-ray tube, produced by random interference. 

  • The season of fresh grass; spring or summer. 

  • An informer, police informer; one who betrays a group (of criminals, etc) to the authorities. 

  • The surface of a mine. 

  • A lawn. 

  • Various plants not in family Poaceae that resemble grasses. 

  • Noise on an A-scope or similar type of radar display. 

  • Any plant of the family Poaceae, characterized by leaves that arise from nodes in the stem and leaf bases that wrap around the stem, especially those grown as ground cover rather than for grain. 

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