Atlas vs mainstay

Atlas

noun
  • A particular model or individual specimen of the Atlas missile and launch vehicle line. 

name
  • The SM-65, an early ICBM, soon developed into a long-lived orbital launch vehicle series. 

  • A subgroup of the Berber languages. 

  • A surname. 

  • A moon of Saturn. 

  • A crater in the last quadrant of the moon. 

  • The son of Iapetus and Clymene, war leader of the Titans ordered by the god Zeus to support the sky on his shoulders; father to Hesperides, the Hyades, and the Pleiades; king of the legendary Atlantis. 

  • A triple star system in the Pleiades open cluster (M45) also known as 27 Tauri. 

mainstay

noun
  • Someone or something that can be depended on to make a regular contribution. 

  • A stabilising rope from the top of the mainmast to the bottom of the foremast. 

  • A chief support. 

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