middle vs nucleus

middle

noun
  • The central part of a human body; the waist. 

  • A centre, midpoint. 

  • The part between the beginning and the end. 

  • The middle stump. 

  • The middle voice. 

adj
  • Pertaining to the middle voice. 

  • Located in the middle; in between. 

  • Central. 

nucleus

noun
  • The core, central part of something, around which other elements are assembled. 

  • A large membrane-enclosed organelle found in eukaryotic cells which contains genetic material. 

  • The central part of a syllable, most commonly a vowel. 

  • An initial part or version that will receive additions. 

  • The massive, positively charged central part of an atom, made up of protons and neutrons. 

  • A ganglion, cluster of many neuronal bodies where synapsing occurs. 

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