seven vs seventh

seven

noun
  • The digit/figure 7 or an occurrence thereof. 

  • A card bearing seven pips. 

num
  • A numerical value equal to 7; the number following six and preceding eight. This many dots: (•••••••). Describing a group or set with seven elements. 

seventh

noun
  • The person or thing in the seventh position. 

  • A tone of the seventh degree from a given tone, the interval between two such tones, or the two tones sounding in unison. 

  • One of seven equal parts of a whole. 

adj
  • The ordinal form of the number seven. 

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