save vs should

save

verb
  • To obviate or make unnecessary. 

  • To keep (something) safe; to safeguard. 

  • To spare (somebody) from effort, or from something undesirable. 

  • To redeem or protect someone from eternal damnation. 

  • To catch or deflect (a shot at goal). 

  • To store for future use. 

  • To economize or avoid waste. 

  • To preserve, as a relief pitcher, (a win of another pitcher's on one's team) by defending the lead held when the other pitcher left the game. 

  • To write a file to disk or other storage medium. 

  • To refrain from romantic or (especially in later use) sexual relationships until one is married or is with a suitable partner. 

  • To help (somebody) to survive, or rescue (somebody or something) from harm. 

  • To conserve or prevent the wasting of. 

  • To accumulate money or valuables. 

prep
  • Except; with the exception of. 

conj
  • unless; except 

noun
  • The act, process, or result of saving data to a storage medium. 

  • A saving throw. 

  • A successful attempt by a relief pitcher to preserve the win of another pitcher on one's team. 

  • In various sports, a block that prevents an opponent from scoring. 

  • An instance of preventing (further) harm or difficulty. 

  • A point in a professional wrestling match when one or more wrestlers run to the ring to aid a fellow wrestler who is being beaten. 

  • An action that brings one back out of an awkward situation. 

should

verb
  • Used to give advice or opinion that an action is, or would have been, beneficial or desirable. 

  • Will be likely to (become or do something); indicates a degree of possibility or probability that the stated thing will happen or be true in the future. 

  • Indicates that something is expected to have happened or to be the case now. 

  • Used to express a conditional outcome. 

  • With verbs such as 'see' or 'hear', usually in the second person, used to point out something remarkable in either a good or bad way. 

  • To make a statement of what ought to be true, as opposed to reality. 

  • Used to impart a tentative, conjectural or polite nuance. 

  • Used to express what the speaker would do in another person's situation, as a means of giving a suggestion or recommendation. 

  • Simple past tense of shall. 

  • In questions, asks what is correct, proper, desirable, etc. 

  • Used to issue an instruction (traditionally seen as carrying less force of authority than alternatives such as 'shall' or 'must'). 

  • Used to form a variant of the present subjunctive, expressing a state or action that is hypothetical, potential, mandated, etc. 

noun
  • Something that ought to be the case as opposed to already being the case. 

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