student nurse vs probationer

student nurse and probationer both are nouns.

Word	Noun	Adjective	Verb	Adverb
student nurse	Yes	No	No	No
probationer	Yes	No	No	No

As nouns, student nurse and probationer are synonyms defined as:

student nurse and probationer: a nurse in training who is undergoing a trial period

student nurse (noun)	probationer (noun)
a nurse in training who is undergoing a trial period	someone released on probation or on parole
	a nurse in training who is undergoing a trial period