later vs ultimately

later

adv
  • Afterward in time (used with than when comparing with another time). 

  • At some unspecified time in the future. 

intj
  • See you later; goodbye. 

adj
  • At some time in the future. 

  • Coming afterward in distance (following an antecedent distance as embedded within an adverbial phrase) 

  • Coming afterward in time (used with than when comparing with another time). 

ultimately

adv
  • Used to indicate the etymon at which a given etymological derivation terminates. 

  • Indicating the most important action. 

  • Indicating the last item. 

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