silly vs nestling

silly and nestling both are nouns.

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

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

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

silly (noun)	nestling (noun)
a word used for misbehaving children	young bird not yet fledged
	a young person of either sex

silly (adjective)	nestling (adjective)
dazed from or as if from repeated blows
ludicrous, foolish
lacking seriousness; given to frivolity
inspiring scornful pity