tail end vs ultimate

tail end

noun
  • The last part of a period of time, event, or situation; the concluding or final part. 

  • The hindmost part of anything (a person, animal, or object), the rear end; the butt, buttocks; hindquarters, rump. 

ultimate

noun
  • The final or most distant point; the conclusion 

  • The greatest extremity; the maximum 

  • The most basic or fundamental of a set of things 

adj
  • Being the most distant or extreme; farthest. 

  • That will happen at some time; eventual. 

  • Final; last in a series. 

  • Last in a word or other utterance. 

  • Being the greatest possible; maximum; most extreme. 

  • Last in a train of progression or consequences; tended toward by all that precedes; arrived at, as the last result; final. 

  • Incapable of further analysis; incapable of further division or separation; constituent; elemental. 

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