old folks' home vs rest home

old folks' home

noun
  • a residential complex for elderly people often equipped with special facilities and care services. 

  • nursing home 

rest home

noun
  • A place of residence for people who require constant nursing care and have significant deficiencies with activities of daily living, such as the elderly and younger adults with physical disabilities. 

How often have the words old folks' home and rest home occurred in a corpus of books? (source: Google Ngram Viewer )