intractable vs refractory

intractable is not a noun while refractory is a noun.

Word	Noun	Adjective	Verb	Adverb
intractable	No	Yes	No	No
refractory	Yes	Yes	No	No

intractable (noun)	refractory (noun)
	lining consisting of material with a high melting point; used to line the inside walls of a furnace

intractable (adjective)	refractory (adjective)
not tractable; difficult to manage or mold	stubbornly resistant to authority or control
	temporarily unresponsive or not fully responsive to a process or stimulus
	not responding to treatment