ferromagnetic vs ferromagnetism

ferromagnetic is not a noun while ferromagnetism is a noun.

Word	Noun	Adjective	Verb	Adverb
ferromagnetic	No	Yes	No	No
ferromagnetism	Yes	No	No	No

ferromagnetic (noun)	ferromagnetism (noun)
	phenomenon exhibited by materials like iron (nickel or cobalt) that become magnetized in a magnetic field and retain their magnetism when the field is removed

ferromagnetic (adjective)	ferromagnetism (adjective)
relating to or demonstrating ferromagnetism