British spelling vs philtre

British spelling and philtre both are nouns.

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

British spelling (noun)	philtre (noun)
English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable')	a drink credited with magical power; can make the one who takes it love the one who gave it