El término 'Practitioner' en medicina en el Reino Unido casí siempre implica 'especialización' p. ej.
What is a care practitioner?
The answer to the question ‘What is a care practitioner?' is that they're a
health specialist who provides care to older adults living in care homes
https://uk.indeed.com/career-advice/finding-a-job/what-care-...A
nurse practitioner is a registered nurse who has received
additional university education to increase their ability to treat, diagnose, counsel and educate patients, who have Minor Illnesses. They can even prescribe.
https://www.nelsonmedicalpractice.co.uk/staff/what-is-a-nurs...