probationer vs student nurse

probationer and student nurse both are nouns.

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

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

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

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