either vs yet

either

adv
  • As well. 

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

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

det
  • Any one (of two). 

  • Each of two; both. 

yet

adv
  • In addition. 

  • Not as of the time referenced. 

  • At some future time; eventually. 

  • In negative imperative use, asking for an action to be delayed. 

  • Even. 

  • In negative or interrogative use, often with an expectation or potential of something happening in the future. 

conj
  • Nevertheless; however; but; despite that. 

noun
  • A metal pan or boiler; yetling. 

verb
  • To get. 

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