unmoving vs sitting

unmoving is not a noun while sitting is a noun.

Word	Noun	Adjective	Verb	Adverb
unmoving	No	Yes	No	No
sitting	Yes	Yes	No	No

unmoving (noun)	sitting (noun)
	the act of assuming or maintaining a seated position
	(photography) the act of assuming a certain position (as for a photograph or portrait)
	a session as of a legislature or court
	a meeting of spiritualists

unmoving (adjective)	sitting (adjective)
not arousing emotions	(of persons) having the torso erect and legs bent with the body supported on the buttocks
not in motion	not moving and therefore easy to attack