never vs yet

never

adv
  • Negative particle (used to negate verbs in the simple past tense; also used absolutely). 

  • At no time; on no occasion; in no circumstance. 

  • Not at any other time; not on any other occasion; not previously. 

intj
  • A statement of defiance 

yet

conj
  • Nevertheless; however; but; despite that. 

noun
  • A metal pan or boiler; yetling. 

adv
  • Not as of the time referenced. 

  • At some future time; eventually. 

  • In addition. 

  • 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. 

verb
  • To get. 

How often have the words never and yet occurred in a corpus of books? (source: Google Ngram Viewer )