restlessness vs agitation

restlessness and agitation both are nouns.

Word	Noun	Adjective	Verb	Adverb
restlessness	Yes	No	No	No
agitation	Yes	No	No	No

As nouns, agitation is a hypernym of restlessness; that is, agitation is a word with a broader meaning than restlessness:

restlessness (noun)	agitation (noun)
inability to rest or relax or be still	disturbance usually in protest
the quality of being ceaselessly moving or active	the act of agitating something; causing it to move around (usually vigorously)
a feeling of agitation expressed in continual motion	the feeling of being agitated; not calm
a lack of patience; irritation with anything that causes delay	a state of agitation or turbulent change or development
	a mental state of extreme emotional disturbance