early morning vs morning

early morning

noun

  • the time between midnight and sunrise 

morning

noun

  • The early part of the day, especially from dawn to noon. 

  • The first alcoholic drink of the day; a morning draught. 

  • The early part of anything. 

intj

  • A greeting said in the morning; shortening of good morning 

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