immobilise vs immobilisation

immobilise is not a noun while immobilisation is a noun.

Word	Noun	Adjective	Verb	Adverb
immobilise	No	No	Yes	No
immobilisation	Yes	No	No	No

immobilise (noun)	immobilisation (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

immobilise (verb)	immobilisation (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