nuclear energy vs atomic energy

nuclear energy and atomic energy both are nouns.

Word	Noun	Adjective	Verb	Adverb
nuclear energy	Yes	No	No	No
atomic energy	Yes	No	No	No

As nouns, nuclear energy and atomic energy are synonyms defined as:

nuclear energy and atomic energy: the energy released by a nuclear reaction

nuclear energy (noun)	atomic energy (noun)
the energy released by a nuclear reaction	the energy released by a nuclear reaction