toddler vs nestling

toddler and nestling both are nouns.

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

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

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

toddler (noun)	nestling (noun)
a young child who is just beginning to walk	young bird not yet fledged
	a young person of either sex