adjunct vs backup

adjunct

adj
  • Added to a faculty or staff in a secondary position. 

  • Connected in a subordinate function. 

noun
  • An unmalted grain or grain product that supplements the main mash ingredient. 

  • A dispensable phrase in a clause or sentence that modifies its meaning. 

  • A constituent which is both the daughter and the sister of an X-bar. 

  • Symploce. 

  • One of a pair of morphisms which relate to each other through a pair of adjoint functors. 

  • A person associated with another, usually in a subordinate position; a colleague. 

  • A key or scale closely related to another as principal; a relative or attendant key. 

  • An appendage; something attached to something else in a subordinate capacity. 

backup

adj
  • Standby, reserve or extra. 

  • Supporting, reinforcing; (music) of or related to accompaniment 

  • That is intended as a backup. 

noun
  • reinforcements 

  • A copy of a file or record, stored separately from the original, that can be used to recover the original if it is destroyed or damaged. 

  • A reserve or substitute. 

  • An accumulation of material caused by a (partial) obstruction or (complete) blockage of the flow or movement of the material, or an accumulation of material that causes an overflow due to the flow being greater than the maximum possible flow. 

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