kiddy vs nestling

kiddy and nestling both are nouns.

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

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

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

kiddy (noun)	nestling (noun)
informal term for a young child	young bird not yet fledged
	a young person of either sex