British spelling vs ionisation

British spelling and ionisation both are nouns.

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

British spelling (noun)	ionisation (noun)
English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable')	the process of ionizing; the formation of ions by separating atoms or molecules or radicals or by adding or subtracting electrons from atoms by strong electric fields in a gas
	the condition of being dissociated into ions (as by heat or radiation or chemical reaction or electrical discharge)