fledgling vs newcomer

fledgling and newcomer both are nouns.

Word	Noun	Adjective	Verb	Adverb
fledgling	Yes	Yes	No	No
newcomer	Yes	No	No	No

As nouns, fledgling and newcomer are synonyms defined as:

Other synonyms of fledgling include entrant, fledgeling, freshman, neophyte, newbie, starter.

fledgling (noun)	newcomer (noun)
young bird that has just fledged or become capable of flying	any new participant in some activity
any new participant in some activity	a recent arrival

fledgling (adjective)	newcomer (adjective)
(of a young bird) having acquired its flight feathers
young and inexperienced