British spelling vs isomerisation

British spelling and isomerisation both are nouns.

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

British spelling (noun)	isomerisation (noun)
English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable')	the conversion of a compound into an isomer of itself