declension vs upgrade

declension

noun
  • The act of declining a word; the act of listing the inflections of a noun, pronoun or adjective in order. 

  • A way of categorizing nouns, pronouns, or adjectives according to the inflections they receive. 

  • The product of that act; a list of declined forms. 

  • A falling off, decay or descent. 

upgrade

noun
  • An improvement 

  • An upward grade or slope. 

  • An improved component or replacement item, usually applied to technology 

verb
  • To improve, usually applied to technology, generally by complete replacement of one or more components 

  • To replace with something better. 

  • To improve the equipment or furnishings of or services rendered to 

  • To replace a program with a later version of itself, a version having a higher version number or marketed under a more recent product name. 

  • To improve in condition or status. 

adv
  • Up a slope or grade. 

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