electromagnetism vs magnetism

electromagnetism and magnetism both are nouns.

Word	Noun	Adjective	Verb	Adverb
electromagnetism	Yes	No	No	No
magnetism	Yes	No	No	No

As nouns, magnetism is a hypernym of electromagnetism; that is, magnetism is a word with a broader meaning than electromagnetism:

electromagnetism: magnetism produced by an electric current
magnetism: attraction for iron; associated with electric currents as well as magnets; characterized by fields of force

Other hypernyms of electromagnetism include magnetic attraction, magnetic force.

electromagnetism (noun)	magnetism (noun)
the branch of physics concerned with electromagnetic phenomena	the branch of science that studies magnetism
magnetism produced by an electric current	attraction for iron; associated with electric currents as well as magnets; characterized by fields of force