nth vs unnamed

nth

adj

  • Occurring at a relatively large but unspecified position in a series. 

  • Occurring at position n in a sequence. 

noun

  • The item at position n in a sequence. 

  • The item in a relatively large but unspecified position in a series. 

unnamed

adj

  • Not named or specified. 

  • Not having a name. 

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