1.  probationer(n = noun.person) student nurse - a nurse in training who is undergoing a trial period;
is a kind of nurse

2.  probationer(n = noun.person) parolee - someone released on probation or on parole;
is a kind of criminal, crook, felon, malefactor, outlaw

1.  One who is undergoing probation; one who is on trial; a novice. [1913 Webster]
"While yet a young probationer,
And candidate of heaven." [1913 Webster]

2.  A student in divinity, who, having received certificates of good morals and qualifications from his university, is admitted to several trials by a presbytery, and, on acquitting himself well, is licensed to preach. [1913 Webster]

probationer, n.
1 a person on probation, e.g. a newly appointed nurse, teacher, etc.
2 an offender on probation.

Derivative:
probationership n.

N  learner, scholar, student, pupil, apprentice, prentice, journeyman, articled clerk, beginner, tyro, amateur, rank amateur, abecedarian, alphabetarian, alumnus, eleve, recruit, raw recruit, novice, neophyte, inceptor, catechumen, probationer, seminarian, chela, fellow-commoner, debutant, intern, resident, schoolboy, fresh, freshman, frosh, junior soph, junior, senior soph, senior, sophister, sophomore, questionist, undergraduate, graduate student, law student, medical student, pre-med, post-doctoral student, post-doc, matriculated student, part-time student, night student, auditor, class, grade, seminar, form, remove, pupilage, disciple, follower, apostle, proselyte, fellow-student, condisciple, school, in statu pupillari, in leading strings, practise makes perfect.