later vs posthumous

later

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

  • At some time in the future. 

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

intj
  • See you later; goodbye. 

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

  • At some unspecified time in the future. 

posthumous

adj
  • After the death of someone. 

  • In reference to a work, published after the author's death. 

  • Taking place after one's own death. 

  • Born after the death of one's father. 

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