Noun

• S: (n) newcomer, fledgling, fledgeling, starter, neophyte, freshman, newbie, entrant (any new participant in some activity)
• S: (n) fledgling, fledgeling (young bird that has just fledged or become capable of flying)

Adjective

• S: (adj) fledgling, fledgeling ((of a young bird) having acquired its flight feathers) "a fledgling robin"
• S: (adj) fledgling, unfledged, callow (young and inexperienced) "a fledgling enterprise"; "a fledgling skier"; "an unfledged lawyer"