Sun vs Sunday

Sun

name
  • The star at the center of the Solar System (our solar system), which shines in our sky, represented in astronomy and astrology by ☉. 

  • The 91st sura (chapter) of the Qur'an. 

  • An English tabloid newspaper. 

  • A surname. 

Sunday

noun
  • A comic strip published in a Sunday newspaper. 

  • The first day of the week in many religious traditions, and the seventh day of the week in systems using the ISO 8601 standard; the Christian Sabbath; the Lord's Day; it follows Saturday and precedes Monday. 

  • A newspaper published on Sunday. 

adv
  • On Sundays. 

verb
  • To spend Sunday (at a certain place, with a certain person or people, etc.). 

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