assistant vs practical nurse

assistant

noun
  • A person who assists or helps someone else. 

  • A software tool that provides assistance in some task, a wizard program. 

  • Sales assistant. 

adj
  • Helping; lending aid or support; auxiliary. 

  • Having a subordinate or auxiliary position. 

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 assistant and practical nurse occurred in a corpus of books? (source: Google Ngram Viewer )