immobilizing vs immobilisation

immobilizing and immobilisation both are nouns.

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

As nouns, immobilizing and immobilisation are synonyms defined as:

immobilizing and immobilisation: the act of limiting movement or making incapable of movement

Other synonyms of immobilizing include immobilization.

immobilizing (noun)	immobilisation (noun)
the act of limiting movement or making incapable of movement	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