immobilize vs immobilization

immobilize is not a noun while immobilization is a noun.

Word	Noun	Adjective	Verb	Adverb
immobilize	No	No	Yes	No
immobilization	Yes	No	No	No

immobilize (noun)	immobilization (noun)
	the act of limiting movement or making incapable of movement
	fixation (as by a plaster cast) of a body part in order to promote proper healing

immobilize (verb)	immobilization (verb)
cause to be unable to move
prohibit the conversion or use of (assets)
convert (assets) into fixed capital
make defenseless
to hold fast or prevent from moving
hold as reserve or withdraw from circulation; of capital