nest egg vs savings

nest egg and savings both are nouns.

Word	Noun	Adjective	Verb	Adverb
nest egg	Yes	No	No	No
savings	Yes	No	No	No

As nouns, nest egg and savings are synonyms defined as:

nest egg (noun)	savings (noun)
device consisting of an artificial egg left in a nest to induce hens to lay their eggs in it	a fund of money put by as a reserve
a fund of money put by as a reserve