laundromat vs laundry room

laundromat

noun
  • A self-service laundry facility with (traditionally) coin-operated (which now may use other per-load payment methods) washing machines, dryers, and sometimes ironing or pressing machines, open to the public for washing clothing and household cloth items. 

laundry room

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