atomic power vs atomic energy

atomic power and atomic energy both are nouns.

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

As nouns, atomic energy is a hypernym of atomic power; that is, atomic energy is a word with a broader meaning than atomic power:

atomic power: nuclear energy regarded as a source of electricity for the power grid (for civilian use)
atomic energy: the energy released by a nuclear reaction

Other hypernyms of atomic power include nuclear energy.

atomic power (noun)	atomic energy (noun)
nuclear energy regarded as a source of electricity for the power grid (for civilian use)	the energy released by a nuclear reaction