grass vs turf

grass

verb
  • To cover with grass or with turf. 

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

  • To feed with grass. 

  • 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 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. 

turf

verb
  • To cover with turf; to create a lawn by laying turfs. 

  • To expel, eject, or throw out; to turf out. 

  • To throw a frisbee well short of its intended target, usually causing it to hit the ground within 10 yards of its release. 

  • To cancel a project or product. 

  • To transfer or attempt to transfer (a patient or case); to eschew or avoid responsibility for. 

  • To fire from a job or dismiss from a task. 

noun
  • A racetrack, hippodrome; or the sport of racing horses. 

  • A piece of such a layer cut from the soil. May be used as sod to make a lawn, dried for peat, stacked to form earthen structures, etc. 

  • A layer of earth covered with grass; sod. 

  • A block of peat used as fuel. 

  • A territory claimed by a person, gang, etc., as their own. 

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