fledgeling vs fledged

fledgeling is a noun but fledged is not a noun.

Word	Noun	Adjective	Verb	Adverb
fledgeling	Yes	Yes	No	No
fledged	No	Yes	No	No

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

fledgeling (adjective)	fledged (adjective)
(of a young bird) having acquired its flight feathers	(of birds) having developed feathers or plumage; often used in combination
	(of an arrow) equipped with feathers