nestling vs tiddler

nestling and tiddler both are nouns.

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

As nouns, nestling and tiddler are synonyms defined as:

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

nestling (noun)	tiddler (noun)
young bird not yet fledged	a young person of either sex
a young person of either sex