linear metre vs British spelling

linear metre and British spelling both are nouns.

Word	Noun	Adjective	Verb	Adverb
linear metre	Yes	No	No	No
British spelling	Yes	No	No	No

linear metre (noun)	British spelling (noun)
a meter in which the deflection of the pointer is proportional to the quantity measured.	English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable')