Any new participant in some activity.

synoniemen: entrant, fledgling, freshman, neophyte, newbie, newcomer, starter.

Nederlands: beginneling, groentje, debutant, beginner, nieuweling, nieuwkomer
Pools: nowy

Young bird that has just fledged or become capable of flying.

synoniem: fledgling.

Nederlands: melkmuil, nieuweling
Pools: ptaszę

of a young bird Having acquired its flight feathers.

synoniem: fledgling.