custodian vs dry cleaner

custodian

noun
  • a janitor; a cleaner 

  • A person entrusted with the custody or care of something or someone; a caretaker or keeper. 

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. 

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