fledged vs fledgeling

fledged is not a noun while fledgeling is a noun.

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

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

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