nanometre vs British spelling

nanometre and British spelling both are nouns.

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

nanometre (noun)	British spelling (noun)
a metric unit of length equal to one billionth of a meter	English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable')