high-energy physics vs particle physics

high-energy physics and particle physics both are nouns.

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

As nouns, high-energy physics and particle physics are synonyms defined as:

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

Other synonyms of high-energy physics include high energy physics.

high-energy physics (noun)	particle physics (noun)
the branch of physics that studies subatomic particles and their interactions	the branch of physics that studies subatomic particles and their interactions