celestial vs ethereal

celestial

adj
  • Synonym of heavenly: of or related to Heaven and the divine. 

  • Of or pertaining to the highest degree of glory. 

  • Relating to the sky or outer space, regarded as the realm of the sun, moon, planets, and stars. 

  • Extremely good, pleasant, or blissful; heavenly. 

noun
  • An inhabitant of heaven. 

ethereal

adj
  • Consisting of ether; hence, exceedingly light or airy; tenuous; spiritlike; characterized by extreme delicacy, as form, manner, thought, etc. 

  • Pertaining to the (real or hypothetical) upper, purer air, or to the higher regions beyond the earth or beyond the atmosphere. 

  • To do with diethyl ether. 

  • Pertaining to the immaterial realm, as symbolically represented by, or (in earlier epochs) conflated with, such atmospheric and extra-atmospheric concepts. 

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