disorder vs instability

disorder and instability both are nouns.

Word	Noun	Adjective	Verb	Adverb
disorder	Yes	No	Yes	No
instability	Yes	No	No	No

As nouns, instability is a hyponym of disorder; that is, instability is a word with a more specific, narrower meaning than disorder:

disorder (noun)	instability (noun)
a disturbance of the peace or of public order	the quality or attribute of being unstable and irresolute
a condition in which things are not in their expected places	unreliability attributable to being unstable
a physical condition in which there is a disturbance of normal functioning	an unstable order
	a lack of balance or state of disequilibrium

disorder (verb)	instability (verb)
bring disorder to
disturb in mind or make uneasy or cause to be worried or alarmed