nonmalignant tumour vs British spelling

nonmalignant tumour and British spelling both are nouns.

Word	Noun	Adjective	Verb	Adverb
nonmalignant tumour	Yes	No	No	No
British spelling	Yes	No	No	No

nonmalignant tumour (noun)	British spelling (noun)
a tumor that is not cancerous	English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable')