dry cleaner vs helper

dry cleaner

noun
  • A person whose business is the dry cleaning of clothes and other fabrics. 

  • A business establishment that engages in the dry cleaning of clothes and other fabrics. 

helper

noun
  • A person who does cleaning and cooking in a family home, or in a market; domestic employee. 

  • That which helps; anything serving to assist. 

  • One who helps; an aide; assistant; auxiliary. 

  • A locomotive that assists a train, usually on steep gradients. 

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