nuclear physics vs nucleonics

nuclear physics and nucleonics both are nouns.

Word	Noun	Adjective	Verb	Adverb
nuclear physics	Yes	No	No	No
nucleonics	Yes	No	No	No

As nouns, nuclear physics and nucleonics are synonyms defined as:

nuclear physics and nucleonics: the branch of physics that studies the internal structure of atomic nuclei

Other synonyms of nuclear physics include atomic physics.

nuclear physics (noun)	nucleonics (noun)
the branch of physics that studies the internal structure of atomic nuclei	the branch of physics that studies the internal structure of atomic nuclei