catatonic vs catatonia

catatonic is not a noun while catatonia is a noun.

Word	Noun	Adjective	Verb	Adverb
catatonic	No	Yes	No	No
catatonia	Yes	No	No	No

catatonic (noun)	catatonia (noun)
	a form of schizophrenia characterized by a tendency to remain in a fixed stuporous state for long periods; the catatonia may give way to short periods of extreme excitement
	extreme tonus; muscular rigidity; a common symptom in catatonic schizophrenia

catatonic (adjective)	catatonia (adjective)
characterized by catatonia especially either rigidity or extreme laxness of limbs