British spelling vs immoveable

British spelling is a noun but immoveable is not a noun.

Word	Noun	Adjective	Verb	Adverb
British spelling	Yes	No	No	No
immoveable	No	Yes	No	No

British spelling (noun)	immoveable (noun)
English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable')

British spelling (adjective)	immoveable (adjective)
	not able or intended to be moved