Sunday vs week

Sunday

noun
  • 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 comic strip published in a Sunday newspaper. 

  • A newspaper published on Sunday. 

adv
  • On Sundays. 

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

week

noun
  • A period of seven days beginning with Sunday or Monday. 

  • A period of five days beginning with Monday. 

  • A subdivision of the month into longer periods of work days punctuated by shorter weekend periods of days for markets, rest, or religious observation such as a sabbath. 

  • Any period of seven consecutive days. 

adj
  • Seven days after (sometimes before) a specified date. 

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