feet vs mora

feet

mora

noun
  • Any tree of the genus Mora of large South American trees. 

  • An ancient Spartan military unit of about a sixth of the Spartan army, typically composed of hoplites. 

  • A unit of syllable weight used in phonology, by which stress, foot structure, or timing of utterance is determined in some languages (e.g. Japanese). 

  • The common mora (Mora moro). 

  • A delay in bringing a claim. 

  • A unit used to measure lines and stanzas of poetry. 

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