electromagnetics vs physics

electromagnetics and physics both are nouns.

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

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

electromagnetics: the branch of physics concerned with electromagnetic phenomena
physics: the science of matter and energy and their interactions

Other hypernyms of electromagnetics include natural philosophy.

electromagnetics (noun)	physics (noun)
the branch of physics concerned with electromagnetic phenomena	the science of matter and energy and their interactions
	the physical properties, phenomena, and laws of something