prickle vs spiculum

prickle

noun
  • A small, sharp pointed object, such as a thorn. 

  • A tingling sensation of mild discomfort. 

  • A kind of willow basket. 

verb
  • To feel a prickle. 

  • To cause (someone) to feel a prickle; to prick. 

spiculum

noun
  • A sharp, pointed crystal, especially of ice. 

  • A thrusting javelin used by Romans that replaced the pilum in the late 3rd century. 

  • A sharp, needle-like structure, especially those making up the skeleton of a sponge. 

  • A small radial emission of gas seen in the chromosphere and corona of the sun. 

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