unagitated vs calm

unagitated is not a noun while calm is a noun.

Word	Noun	Adjective	Verb	Adverb
unagitated	No	Yes	No	No
calm	Yes	Yes	Yes	No

As adjectives, unagitated and calm are synonyms defined as:

Other synonyms of unagitated include serene, tranquil.

unagitated (noun)	calm (noun)
	steadiness of mind under stress
	wind moving at less than 1 knot; 0 on the Beaufort scale

unagitated (adjective)	calm (adjective)
not agitated or disturbed emotionally	(of weather) free from storm or wind
not physically disturbed or set in motion	not agitated; without losing self-possession
not agitated; without losing self-possession

unagitated (verb)	calm (verb)
	cause to be calm or quiet as by administering a sedative to
	make steady
	make calm or still
	become quiet or calm, especially after a state of agitation