Gaia vs Rhea

Gaia

name
  • A Greek goddess, the personification of the earth, and one of the primordial deities from whom all the others descend. 

  • The ecosystem of the Earth regarded as a self-regulating superorganism. 

Rhea

name
  • A female given name from Ancient Greek in occasional use. 

  • A Titan, the daughter of Uranus and Gaia, the mother of Demeter, Hades, Hera, Hestia, Poseidon, and Zeus. 

  • The asteroid 577 Rhea. 

  • Saturn V, one of the moons of Saturn. 

  • A surname 

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