fledged
inexperienced
inexperient
mature
Young Turk
abecedarian
adolescent
alphabetarian
apprentice
arriviste
articled clerk
at half cock
avifauna
baby
baby bird
beginner
bird
bird of Jove
bird of Juno
bird of Minerva
bird of night
bird of passage
bird of prey
birdie
birdlife
birdling
birdy
boot
boy
bright young man
bub
bubba
buck
bud
buddy
cage bird
calf
callow
catechumen
catling
chick
chickling
chicky
colt
comer
cub
cygnet
deb
debutant
dewy
diving bird
dogie
dove
duckling
young bird
Athenian
Phoenician
aspire
award-winning
extraterrestrial
far-flung
full-time
mercantile
nascent
state-owned