British spelling vs bistre

British spelling and bistre both are nouns.

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

British spelling (noun)	bistre (noun)
English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable')	a water-soluble brownish-yellow pigment made by boiling wood soot