babysitter vs practical nurse

babysitter

noun
  • A person who cares for one or more babies or children for a short period of time in place of their legal guardians. 

practical nurse

noun
  • A person who is certified to provide custodial care such as help in walking, bathing, and feeding. 

How often have the words babysitter and practical nurse occurred in a corpus of books? (source: Google Ngram Viewer )