culm vs rattan

culm

noun
  • the stem of a plant, especially of grass or sedge 

  • anthracite, especially when found in small masses 

  • waste coal, used as a poor quality fuel; slack. 

rattan

noun
  • The plant used as a material for making furniture, baskets etc. 

  • A cane made from this material. 

  • Any of several species of climbing palm of the genus Calamus. 

verb
  • To beat with a rattan cane. 

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