But the tire speed rating system isnât without its quirks. For instance, the systemâs European roots give it unusual mile per hour maximums. Another such quirk is that the letter âHâ is out of place. Instead of appearing after âG,â it falls between âUâ and âVâ as does the speed to which it corresponds.
Among them: 1  RNs tend to have more responsibilities and independence in the workplace than LPNs. 2  RNs must usually complete more training than LPNs. 3  LPNs are in higher demand than RNs, nationally speaking.  RNs tend to earn more than LPNs.
They have to necessarily work in the health care organizations and they are not entitled to prescribe medications. In Brief: â RN stands for Registered Nurses whereas NP stands for Nurse Practitioners. â RNs are health care professionals with 2 to 4 year degree in Bachelor of Science in nursing or nursing science.