changeling vs nestling

changeling and nestling both are nouns.

Word	Noun	Adjective	Verb	Adverb
changeling	Yes	No	No	No
nestling	Yes	No	No	No

As nouns, nestling is a hypernym of changeling; that is, nestling is a word with a broader meaning than changeling:

Other hypernyms of changeling include child, fry, kid, minor, nipper, shaver, small fry, tiddler, tike, tyke, youngster.

changeling (noun)	nestling (noun)
a child secretly exchanged for another in infancy	young bird not yet fledged
a person of subnormal intelligence	a young person of either sex