incognito vs nth

incognito

adj
  • Without being known; in an assumed character, or under an assumed title; in disguise. 

noun
  • The assumption of disguise or of a feigned character; the state of being in disguise or not recognized. 

  • One unknown or in disguise, or under an assumed character or name. 

adv
  • Without revealing one's identity. 

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. 

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