unfledged vs fledgling

unfledged is not a noun while fledgling is a noun.

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

As adjectives, unfledged and fledgling are synonyms defined as:

Other synonyms of unfledged include callow.

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

unfledged (adjective)	fledgling (adjective)
(of birds) not yet having developed feathers	(of a young bird) having acquired its flight feathers
young and inexperienced	young and inexperienced
(of an arrow) not equipped with feathers