natural fibre vs British spelling

natural fibre and British spelling both are nouns.

Word	Noun	Adjective	Verb	Adverb
natural fibre	Yes	No	No	No
British spelling	Yes	No	No	No

natural fibre (noun)	British spelling (noun)
fiber derived from plants or animals	English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable')