philtre vs British spelling

philtre and British spelling both are nouns.

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

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