ferrous vs iron

ferrous is not a noun while iron is a noun.

Word	Noun	Adjective	Verb	Adverb
ferrous	No	Yes	No	No
iron	Yes	Yes	Yes	No

ferrous (noun)	iron (noun)
	home appliance consisting of a flat metal base that is heated and used to smooth cloth
	a golf club that has a relatively narrow metal head
	implement used to brand live stock
	a heavy ductile magnetic metallic element; is silver-white in pure form but readily rusts; used in construction and tools and armament; plays a role in the transport of oxygen by the blood

ferrous (adjective)	iron (adjective)
of or relating to or containing iron	extremely robust

ferrous (verb)	iron (verb)
	press and smooth with a heated iron