British spelling vs tumour

British spelling and tumour both are nouns.

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

British spelling (noun)	tumour (noun)
English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable')	an abnormal new mass of tissue that serves no purpose