British spelling vs destabilisation

British spelling and destabilisation both are nouns.

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

British spelling (noun)	destabilisation (noun)
English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable')	the action of destabilizing; making something less stable (especially of a government or country or economy)