one-seventh vs seventh

one-seventh

noun

  • One of seven equal parts (1/7, ⅐). 

seventh

noun

  • One of seven equal parts of a whole. 

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

  • The person or thing in the seventh position. 

adj

  • The ordinal form of the number seven. 

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