rung vs stratum

rung

noun
  • A crosspiece forming a step of a ladder; a round. 

  • A position in a hierarchy. 

  • A crosspiece between legs of a chair. 

verb
  • simple past tense of ring 

adj
  • Of a pig: having a ring through the nose. 

stratum

noun
  • One of several parallel horizontal layers of material arranged one on top of another. 

  • A layer of sedimentary rock having approximately the same composition throughout. 

  • Any of the regions of the atmosphere, such as the stratosphere, that occur as layers. 

  • A class of society composed of people with similar social, cultural, or economic status. 

  • A layer of vegetation, usually of similar height. 

  • The level of accuracy of a computer's clock, relative to others on the network. 

  • A layer of tissue. 

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