immobile vs mobile

immobile is not a noun while mobile is a noun.

Word	Noun	Adjective	Verb	Adverb
immobile	No	Yes	No	No
mobile	Yes	Yes	No	No

immobile (noun)	mobile (noun)
	sculpture suspended in midair whose delicately balanced parts can be set in motion by air currents

immobile (adjective)	mobile (adjective)
not capable of movement or of being moved	moving or capable of moving readily (especially from place to place)
securely fixed in place	having transportation available
	migratory
	affording change (especially in social status)
	capable of changing quickly from one state or condition to another