philter vs philtre

philter and philtre both are nouns.

Word	Noun	Adjective	Verb	Adverb
philter	Yes	No	No	No
philtre	Yes	No	No	No

As nouns, philter and philtre are synonyms defined as:

philter and philtre: a drink credited with magical power; can make the one who takes it love the one who gave it

Other synonyms of philter include love-philter, love-philtre, love-potion.

philter (noun)	philtre (noun)
a drink credited with magical power; can make the one who takes it love the one who gave it	a drink credited with magical power; can make the one who takes it love the one who gave it