nipper vs nestling

nipper and nestling both are nouns.

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

As nouns, nipper and nestling are synonyms defined as:

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

nipper (noun)	nestling (noun)
a grasping structure on the limb of a crustacean or other arthropods	young bird not yet fledged
a young person of either sex	a young person of either sex