helping verb vs subordinate

helping verb

noun
  • An auxiliary verb; a verb that accompanies the main verb in a clause. 

subordinate

noun
  • One who is subordinate. 

adj
  • Descending in a regular series. 

  • Placed in a lower class, rank, or position. 

  • dependent on and either modifying or complementing the main clause 

  • Submissive or inferior to, or controlled by authority. 

verb
  • To make subservient. 

  • To treat as of less value or importance. 

  • To make of lower priority in order of payment in bankruptcy. 

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