false friend vs grass

false friend

noun
  • Used other than figuratively or idiomatically: see false, friend. 

  • A word in a language that bears a deceptive resemblance to a word in another language but in fact has a different meaning. 

grass

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

  • 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. 

  • 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. 

verb
  • 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 cover with grass or with turf. 

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

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