helmet vs straw

helmet

noun
  • A contemptible or stupid person. 

  • The hood-shaped upper sepal or petal of some flowers, as of the monkshood or the snapdragon. 

  • A naked shield or protuberance on the top or fore part of the head of a bird. 

  • The feature above a shield on a coat of arms. 

  • The glans penis. 

  • A hard, protective head covering, typically part of armour. 

  • The upper part of a chemist's retort. 

verb
  • To cover with, or as if with, a helmet. 

straw

noun
  • Anything proverbially worthless; the least possible thing. 

  • A pale, yellowish beige colour, like that of a dried straw. 

  • A dried stalk of a cereal plant. 

  • Such dried stalks considered collectively; this bulk matter may be a chief salable product, a by-product, fodder, bedding, or green manure, depending on region and on current market conditions. 

  • A drinking straw. 

verb
  • To lay straw around plants to protect them from frost. 

adj
  • Made of straw. 

  • Of a pale, yellowish beige colour, like that of a dried straw. 

  • Imaginary, but presented as real. 

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