nestling vs small fry

nestling and small fry both are nouns.

Word	Noun	Adjective	Verb	Adverb
nestling	Yes	No	No	No
small fry	Yes	No	No	No

As nouns, nestling and small fry are synonyms defined as:

Other synonyms of nestling include child, fry, kid, minor, nipper, shaver, tiddler, tike, tyke, youngster.

nestling (noun)	small fry (noun)
young bird not yet fledged	someone who is small and insignificant
a young person of either sex	a young person of either sex