advanced vs initial

advanced

adj
  • Indicating a time ahead of the correct time. 

  • with greater complexity, more difficult 

  • At or close to the state of the art. 

  • Pronounced farther to the front of the vocal tract. 

  • Having moved forward in time or space (e.g. advanced ignition timing). 

  • In a late stage of development; greatly developed beyond an initial stage. 

initial

adj
  • Chronologically first, early; of or pertaining to the beginning, cause or origin. 

  • Spatially first, placed at the beginning, in the first position; especially said of the first letter of a word. 

verb
  • To sign one's initial(s), as an abbreviated signature. 

noun
  • A distinguished initial letter of a chapter or section of a document. 

  • onset, part of a syllable that precedes the syllable nucleus in phonetics and phonology. 

  • The first letter of a word or a name. 

  • In plural, the first letter of each word of a person's full name considered as a unit. 

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