tiddler vs nestling

tiddler and nestling both are nouns.

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

As nouns, tiddler and nestling are synonyms defined as:

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

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