atomic physics vs physics

atomic physics and physics both are nouns.

Word	Noun	Adjective	Verb	Adverb
atomic physics	Yes	No	No	No
physics	Yes	No	No	No

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

atomic physics: the branch of physics that studies the internal structure of atomic nuclei
physics: the science of matter and energy and their interactions

Other hypernyms of atomic physics include natural philosophy.

atomic physics (noun)	physics (noun)
the branch of physics that studies the internal structure of atomic nuclei	the science of matter and energy and their interactions
	the physical properties, phenomena, and laws of something