extra vs more

extra

det
  • Denotes more. 

noun
  • A run scored without the ball having hit the striker's bat - a wide, bye, leg bye or no ball. 

  • A supernumerary or walk-on in a film or play. 

  • An extra edition of a newspaper, which is printed outside of the normal printing cycle, for example to report an important late-breaking event. 

  • The state or trait of being over the top, of behaving in an overly dramatic manner. 

  • Something additional, such as an item above and beyond the ordinary school curriculum, or added to the usual charge on a bill. 

  • Something of an extra quality or grade. 

adv
  • To an extraordinary degree. 

adj
  • Beyond what is due, usual, expected, or necessary; extraneous; additional; supernumerary. 

  • Over the top; going beyond what is normal or appropriate, often in a dramatic manner. 

more

det
  • Additional; further. 

  • Bigger, stronger, or more valuable. 

adv
  • Used in addition to an inflected comparative form. 

  • To a greater degree or extent. 

  • Used to form the comparative form of adjectives and adverbs. 

  • In negative constructions: any further, any longer; any more. 

noun
  • A plant; flower; shrub. 

  • A root; stock. 

pron
  • A greater number or quantity (of something). 

  • An extra or additional quantity (of something). 

verb
  • To root up. 

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