anxiety disorder vs disturbance

anxiety disorder and disturbance both are nouns.

Word	Noun	Adjective	Verb	Adverb
anxiety disorder	Yes	No	No	No
disturbance	Yes	No	No	No

As nouns, disturbance is a hypernym of anxiety disorder; that is, disturbance is a word with a broader meaning than anxiety disorder:

anxiety disorder: a cover term for a variety of mental disorders in which severe anxiety is a salient symptom
disturbance: (psychiatry) a psychological disorder of thought or emotion; a more neutral term than mental illness

Other hypernyms of anxiety disorder include folie, mental disorder, mental disturbance, psychological disorder.

anxiety disorder (noun)	disturbance (noun)
a cover term for a variety of mental disorders in which severe anxiety is a salient symptom	the act of disturbing something or someone; setting something in motion
	a noisy fight
	activity that is a malfunction, intrusion, or interruption
	electrical or acoustic activity that can disturb communication
	a disorderly outburst or tumult
	(psychiatry) a psychological disorder of thought or emotion; a more neutral term than mental illness
	an unhappy and worried mental state