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medical paramedic
doctors
You call them a veterinarian
a patient
Do you mean when you call on the phone? Of course not; that makes no sense at all.
medicine
According to research conducted in England, more people call in sick on Mondays (over a third).
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It depends on the level of formality. I think invalid is somewhat of an outdated term, more so constained to literature and other written text nowadays. However, depending on the context, I think it would not be impolilte as much as passé to call someone a sick person an invalid. (If you are looking for a word to substitute for the phrase 'a sick person,' though, invalid is probably the best word that exists) Hope this helps!
If he or she is sick,then the parish would call a priest to anoint him and pray for him for his healing.
The word is nurse. A nurse is a person who is trained to take care of sick people.
he helps people that have cancer and that are sick.