lettuce vs tomentum

lettuce

noun
  • An edible plant, Lactuca sativa and its close relatives, having a head of green and/or purple leaves. 

  • long hair, as worn by an exemplar of bro culture 

  • The leaves of the lettuce plant, eaten as a vegetable; as a dish often mixed with other ingredients, dressing etc. 

  • United States paper currency; dollars. 

  • A strong yellow-green colour, like that of lettuce (also called lettuce green). 

  • weed or marijuana 

tomentum

noun
  • A mass of filamentous hairs on the leaf of a plant. 

  • A network of fine blood vessels between the pia mater and the cerebral cortex. 

  • A covering of fine, soft hairs; a pubescence. 

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