high-energy physics vs physics

high-energy physics and physics both are nouns.

Word	Noun	Adjective	Verb	Adverb
high-energy physics	Yes	No	No	No
physics	Yes	No	No	No

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

high-energy physics: the branch of physics that studies subatomic particles and their interactions
physics: the science of matter and energy and their interactions

Other hypernyms of high-energy physics include natural philosophy.

high-energy physics (noun)	physics (noun)
the branch of physics that studies subatomic particles and their interactions	the science of matter and energy and their interactions
	the physical properties, phenomena, and laws of something