either vs much

either

adv
  • As well. 

det
  • Any one (of two). 

  • Each of two; both. 

pron
  • One or the other of two people or things. 

conj
  • Introduces the first of two (or occasionally more) options or possibilities, the second (or last) of which is introduced by “or”. 

much

adv
  • To a great extent. 

  • Often; frequently. 

  • Used to indicate or compare extent. 

pron
  • A large amount or great extent. 

det
  • Many ( + plural countable noun). 

  • A large amount of. 

  • Used to indicate, demonstrate or compare the quantity of something. 

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