plasma physics vs physics

plasma physics and physics both are nouns.

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

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

plasma physics: the branch of physics concerned with matter in its plasma phase
physics: the science of matter and energy and their interactions

Other hypernyms of plasma physics include natural philosophy.

plasma physics (noun)	physics (noun)
the branch of physics concerned with matter in its plasma phase	the science of matter and energy and their interactions
	the physical properties, phenomena, and laws of something