helping verb vs subsidiary

helping verb

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

subsidiary

noun
  • A subordinate theme. 

  • A company owned by a parent company or a holding company, also called daughter company or sister company. 

  • One who aids or supplies; an assistant. 

adj
  • Of or relating to a subsidy. 

  • Auxiliary or supplemental. 

  • Secondary or subordinate. 

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