should vs use

should

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

  • 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. 

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

  • 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. 

use

verb
  • To suggest or request that other people employ a specific set of gender pronouns when referring to the subject. 

  • To habitually do; to be wont to do. (Now chiefly in past-tense forms; see used to.) 

  • To benefit from; to be able to employ or stand. 

  • To consume (alcohol, drugs, etc), especially regularly. 

  • To expend; to consume by employing. 

  • To accustom; to habituate. (Now common only in participial form. Uses the same pronunciation as the noun; see usage notes.) 

  • To employ; to apply; to utilize. 

  • To exploit. 

  • To consume a previously specified substance, especially a drug to which one is addicted. 

noun
  • A function; a purpose for which something may be employed. 

  • Occasion or need to employ; necessity. 

  • Usefulness, benefit. 

  • The act of using. 

  • A special form of a rite adopted for use in a particular context, often a diocese. 

  • A slab of iron welded to the side of a forging, such as a shaft, near the end, and afterward drawn down, by hammering, so as to lengthen the forging. 

  • The act of consuming alcohol or narcotics. 

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