magnetics vs geophysics

magnetics and geophysics both are nouns.

Word	Noun	Adjective	Verb	Adverb
magnetics	Yes	No	No	No
geophysics	Yes	No	No	No

As nouns, geophysics is a hypernym of magnetics; that is, geophysics is a word with a broader meaning than magnetics:

magnetics: the branch of science that studies magnetism
geophysics: geology that uses physical principles to study properties of the earth

Other hypernyms of magnetics include geophysical science.

magnetics (noun)	geophysics (noun)
the branch of science that studies magnetism	geology that uses physical principles to study properties of the earth