plant fibre vs British spelling

plant fibre and British spelling both are nouns.

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

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