foam vs kelp

foam

noun
  • A substance composed of a large collection of bubbles or their solidified remains, especially 

  • A collection of small bubbles created when the surface of a body of water is moved by tides, wind, etc. 

  • Fury. 

  • A material formed by trapping pockets of gas in a liquid or solid. 

  • A collection of small bubbles on the surface of a liquid that is heated, fermented or carbonated. 

  • A collection of small bubbles created by mixing soap with water. 

  • A collection of small bubbles formed by mixing an extinguishing agent with water, used to cover and extinguish fires. 

  • A collection of small bubbles formed from bodily fluids such as saliva or sweat. 

  • The sea. 

verb
  • To form or emit foam. 

  • To spew saliva as foam; to foam at the mouth. 

  • To coat or cover with foam. 

kelp

noun
  • The calcined ashes of seaweed, formerly used in glass and iodine manufacture. 

  • Any of several large brown algae seaweeds (order Laminariales). 

verb
  • To gather kelp. 

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