first
abecedarian
alphabetarian
apprentice
articled clerk
baby
beginner
bejan
boot
cadet
catechumen
colt
deb
debutant
entrant
fledgling
fresher
frosh
greenhorn
greeny
ignoramus
inductee
infant
initiate
junior
learner
midshipman
neophyte
nestling
new boy
newcomer
novice
novitiate
plebe
postulant
probationer
probationist
puny
raw recruit
recruit
rookie
senior
soph
sophomore
tenderfoot
trainee
tyro
undergrad
undergraduate
lowerclassman
underclassman
college
graduate
high-school
sophomores