ether vs reticence

ether

noun
  • The sky, the heavens; the void, nothingness. 

  • Starting fluid. 

  • Diethyl ether (C₄H₁₀O), an organic compound with a sweet odour used in the past as an anaesthetic. 

  • The medium breathed by human beings; the air. 

  • A particular quality created by or surrounding an object, person, or place; an atmosphere, an aura. 

  • Any of a class of organic compounds containing an oxygen atom bonded to two hydrocarbon groups. 

  • The atmosphere or space as a medium for broadcasting radio and television signals; also, a notional space through which Internet and other digital communications take place; cyberspace. 

  • Often as aether and more fully as luminiferous aether: a substance once thought to fill all unoccupied space that allowed electromagnetic waves to pass through it and interact with matter, without exerting any resistance to matter or energy; its existence was disproved by the 1887 Michelson–Morley experiment and the theory of relativity propounded by Albert Einstein (1879–1955). 

verb
  • To viciously humiliate or insult. 

reticence

noun
  • A silent and reserved nature. 

  • Followed by of: discretion or restraint in the use of something. 

  • Often followed by to: hesitancy or reluctance (to do something). 

  • Avoidance of saying or reluctance to say too much; discretion, tight-lippedness; (countable) an instance of acting in this manner. 

verb
  • To deliberately not listen or pay attention to; to disregard, to ignore. 

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