fledgling vs beginner

fledgling and beginner both are nouns.

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

As nouns, beginner is a hypernym of fledgling; that is, beginner is a word with a broader meaning than fledgling:

Other hypernyms of fledgling include initiate, novice, tiro, tyro.

fledgling (noun)	beginner (noun)
young bird that has just fledged or become capable of flying	someone new to a field or activity
any new participant in some activity	a person who founds or establishes some institution

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